1 /* sun3_NCR5380.c -- adapted from atari_NCR5380.c for the sun3 by
2 Sam Creasey. */
3 /*
4 * NCR 5380 generic driver routines. These should make it *trivial*
5 * to implement 5380 SCSI drivers under Linux with a non-trantor
6 * architecture.
7 *
8 * Note that these routines also work with NR53c400 family chips.
9 *
10 * Copyright 1993, Drew Eckhardt
11 * Visionary Computing
12 * (Unix and Linux consulting and custom programming)
13 * drew@colorado.edu
14 * +1 (303) 666-5836
15 *
16 * DISTRIBUTION RELEASE 6.
17 *
18 * For more information, please consult
19 *
20 * NCR 5380 Family
21 * SCSI Protocol Controller
22 * Databook
23 *
24 * NCR Microelectronics
25 * 1635 Aeroplaza Drive
26 * Colorado Springs, CO 80916
27 * 1+ (719) 578-3400
28 * 1+ (800) 334-5454
29 */
30
31 /*
32 * ++roman: To port the 5380 driver to the Atari, I had to do some changes in
33 * this file, too:
34 *
35 * - Some of the debug statements were incorrect (undefined variables and the
36 * like). I fixed that.
37 *
38 * - In information_transfer(), I think a #ifdef was wrong. Looking at the
39 * possible DMA transfer size should also happen for REAL_DMA. I added this
40 * in the #if statement.
41 *
42 * - When using real DMA, information_transfer() should return in a DATAOUT
43 * phase after starting the DMA. It has nothing more to do.
44 *
45 * - The interrupt service routine should run main after end of DMA, too (not
46 * only after RESELECTION interrupts). Additionally, it should _not_ test
47 * for more interrupts after running main, since a DMA process may have
48 * been started and interrupts are turned on now. The new int could happen
49 * inside the execution of NCR5380_intr(), leading to recursive
50 * calls.
51 *
52 * - I've added a function merge_contiguous_buffers() that tries to
53 * merge scatter-gather buffers that are located at contiguous
54 * physical addresses and can be processed with the same DMA setup.
55 * Since most scatter-gather operations work on a page (4K) of
56 * 4 buffers (1K), in more than 90% of all cases three interrupts and
57 * DMA setup actions are saved.
58 *
59 * - I've deleted all the stuff for AUTOPROBE_IRQ, REAL_DMA_POLL, PSEUDO_DMA
60 * and USLEEP, because these were messing up readability and will never be
61 * needed for Atari SCSI.
62 *
63 * - I've revised the NCR5380_main() calling scheme (relax the 'main_running'
64 * stuff), and 'main' is executed in a bottom half if awoken by an
65 * interrupt.
66 *
67 * - The code was quite cluttered up by "#if (NDEBUG & NDEBUG_*) printk..."
68 * constructs. In my eyes, this made the source rather unreadable, so I
69 * finally replaced that by the *_PRINTK() macros.
70 *
71 */
72 #include <scsi/scsi_dbg.h>
73 #include <scsi/scsi_transport_spi.h>
74
75 /*
76 * Further development / testing that should be done :
77 * 1. Test linked command handling code after Eric is ready with
78 * the high level code.
79 */
80
81 #if (NDEBUG & NDEBUG_LISTS)
82 #define LIST(x,y) \
83 { printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); \
84 if ((x)==(y)) udelay(5); }
85 #define REMOVE(w,x,y,z) \
86 { printk("LINE:%d Removing: %p->%p %p->%p \n", __LINE__, \
87 (void*)(w), (void*)(x), (void*)(y), (void*)(z)); \
88 if ((x)==(y)) udelay(5); }
89 #else
90 #define LIST(x,y)
91 #define REMOVE(w,x,y,z)
92 #endif
93
94 #ifndef notyet
95 #undef LINKED
96 #endif
97
98 /*
99 * Design
100 * Issues :
101 *
102 * The other Linux SCSI drivers were written when Linux was Intel PC-only,
103 * and specifically for each board rather than each chip. This makes their
104 * adaptation to platforms like the Mac (Some of which use NCR5380's)
105 * more difficult than it has to be.
106 *
107 * Also, many of the SCSI drivers were written before the command queuing
108 * routines were implemented, meaning their implementations of queued
109 * commands were hacked on rather than designed in from the start.
110 *
111 * When I designed the Linux SCSI drivers I figured that
112 * while having two different SCSI boards in a system might be useful
113 * for debugging things, two of the same type wouldn't be used.
114 * Well, I was wrong and a number of users have mailed me about running
115 * multiple high-performance SCSI boards in a server.
116 *
117 * Finally, when I get questions from users, I have no idea what
118 * revision of my driver they are running.
119 *
120 * This driver attempts to address these problems :
121 * This is a generic 5380 driver. To use it on a different platform,
122 * one simply writes appropriate system specific macros (ie, data
123 * transfer - some PC's will use the I/O bus, 68K's must use
124 * memory mapped) and drops this file in their 'C' wrapper.
125 *
126 * As far as command queueing, two queues are maintained for
127 * each 5380 in the system - commands that haven't been issued yet,
128 * and commands that are currently executing. This means that an
129 * unlimited number of commands may be queued, letting
130 * more commands propagate from the higher driver levels giving higher
131 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported,
132 * allowing multiple commands to propagate all the way to a SCSI-II device
133 * while a command is already executing.
134 *
135 * To solve the multiple-boards-in-the-same-system problem,
136 * there is a separate instance structure for each instance
137 * of a 5380 in the system. So, multiple NCR5380 drivers will
138 * be able to coexist with appropriate changes to the high level
139 * SCSI code.
140 *
141 * A NCR5380_PUBLIC_REVISION macro is provided, with the release
142 * number (updated for each public release) printed by the
143 * NCR5380_print_options command, which should be called from the
144 * wrapper detect function, so that I know what release of the driver
145 * users are using.
146 *
147 * Issues specific to the NCR5380 :
148 *
149 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead
150 * piece of hardware that requires you to sit in a loop polling for
151 * the REQ signal as long as you are connected. Some devices are
152 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect
153 * while doing long seek operations.
154 *
155 * The workaround for this is to keep track of devices that have
156 * disconnected. If the device hasn't disconnected, for commands that
157 * should disconnect, we do something like
158 *
159 * while (!REQ is asserted) { sleep for N usecs; poll for M usecs }
160 *
161 * Some tweaking of N and M needs to be done. An algorithm based
162 * on "time to data" would give the best results as long as short time
163 * to datas (ie, on the same track) were considered, however these
164 * broken devices are the exception rather than the rule and I'd rather
165 * spend my time optimizing for the normal case.
166 *
167 * Architecture :
168 *
169 * At the heart of the design is a coroutine, NCR5380_main,
170 * which is started when not running by the interrupt handler,
171 * timer, and queue command function. It attempts to establish
172 * I_T_L or I_T_L_Q nexuses by removing the commands from the
173 * issue queue and calling NCR5380_select() if a nexus
174 * is not established.
175 *
176 * Once a nexus is established, the NCR5380_information_transfer()
177 * phase goes through the various phases as instructed by the target.
178 * if the target goes into MSG IN and sends a DISCONNECT message,
179 * the command structure is placed into the per instance disconnected
180 * queue, and NCR5380_main tries to find more work. If USLEEP
181 * was defined, and the target is idle for too long, the system
182 * will try to sleep.
183 *
184 * If a command has disconnected, eventually an interrupt will trigger,
185 * calling NCR5380_intr() which will in turn call NCR5380_reselect
186 * to reestablish a nexus. This will run main if necessary.
187 *
188 * On command termination, the done function will be called as
189 * appropriate.
190 *
191 * SCSI pointers are maintained in the SCp field of SCSI command
192 * structures, being initialized after the command is connected
193 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
194 * Note that in violation of the standard, an implicit SAVE POINTERS operation
195 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
196 */
197
198 /*
199 * Using this file :
200 * This file a skeleton Linux SCSI driver for the NCR 5380 series
201 * of chips. To use it, you write an architecture specific functions
202 * and macros and include this file in your driver.
203 *
204 * These macros control options :
205 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
206 * for commands that return with a CHECK CONDITION status.
207 *
208 * LINKED - if defined, linked commands are supported.
209 *
210 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
211 *
212 * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible
213 *
214 * These macros MUST be defined :
215 *
216 * NCR5380_read(register) - read from the specified register
217 *
218 * NCR5380_write(register, value) - write to the specific register
219 *
220 * Either real DMA *or* pseudo DMA may be implemented
221 * REAL functions :
222 * NCR5380_REAL_DMA should be defined if real DMA is to be used.
223 * Note that the DMA setup functions should return the number of bytes
224 * that they were able to program the controller for.
225 *
226 * Also note that generic i386/PC versions of these macros are
227 * available as NCR5380_i386_dma_write_setup,
228 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
229 *
230 * NCR5380_dma_write_setup(instance, src, count) - initialize
231 * NCR5380_dma_read_setup(instance, dst, count) - initialize
232 * NCR5380_dma_residual(instance); - residual count
233 *
234 * PSEUDO functions :
235 * NCR5380_pwrite(instance, src, count)
236 * NCR5380_pread(instance, dst, count);
237 *
238 * If nothing specific to this implementation needs doing (ie, with external
239 * hardware), you must also define
240 *
241 * NCR5380_queue_command
242 * NCR5380_reset
243 * NCR5380_abort
244 * NCR5380_proc_info
245 *
246 * to be the global entry points into the specific driver, ie
247 * #define NCR5380_queue_command t128_queue_command.
248 *
249 * If this is not done, the routines will be defined as static functions
250 * with the NCR5380* names and the user must provide a globally
251 * accessible wrapper function.
252 *
253 * The generic driver is initialized by calling NCR5380_init(instance),
254 * after setting the appropriate host specific fields and ID. If the
255 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
256 * possible) function may be used. Before the specific driver initialization
257 * code finishes, NCR5380_print_options should be called.
258 */
259
260 static struct Scsi_Host *first_instance = NULL;
261 static struct scsi_host_template *the_template = NULL;
262
263 /* Macros ease life... :-) */
264 #define SETUP_HOSTDATA(in) \
265 struct NCR5380_hostdata *hostdata = \
266 (struct NCR5380_hostdata *)(in)->hostdata
267 #define HOSTDATA(in) ((struct NCR5380_hostdata *)(in)->hostdata)
268
269 #define NEXT(cmd) (*(struct scsi_cmnd **)&((cmd)->host_scribble))
270 #define NEXTADDR(cmd) ((struct scsi_cmnd **)&((cmd)->host_scribble))
271
272 #define HOSTNO instance->host_no
273 #define H_NO(cmd) (cmd)->device->host->host_no
274
275 #define SGADDR(buffer) (void *)(((unsigned long)sg_virt(((buffer)))))
276
277 #ifdef SUPPORT_TAGS
278
279 /*
280 * Functions for handling tagged queuing
281 * =====================================
282 *
283 * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes:
284 *
285 * Using consecutive numbers for the tags is no good idea in my eyes. There
286 * could be wrong re-usings if the counter (8 bit!) wraps and some early
287 * command has been preempted for a long time. My solution: a bitfield for
288 * remembering used tags.
289 *
290 * There's also the problem that each target has a certain queue size, but we
291 * cannot know it in advance :-( We just see a QUEUE_FULL status being
292 * returned. So, in this case, the driver internal queue size assumption is
293 * reduced to the number of active tags if QUEUE_FULL is returned by the
294 * target. The command is returned to the mid-level, but with status changed
295 * to BUSY, since --as I've seen-- the mid-level can't handle QUEUE_FULL
296 * correctly.
297 *
298 * We're also not allowed running tagged commands as long as an untagged
299 * command is active. And REQUEST SENSE commands after a contingent allegiance
300 * condition _must_ be untagged. To keep track whether an untagged command has
301 * been issued, the host->busy array is still employed, as it is without
302 * support for tagged queuing.
303 *
304 * One could suspect that there are possible race conditions between
305 * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the
306 * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(),
307 * which already guaranteed to be running at most once. It is also the only
308 * place where tags/LUNs are allocated. So no other allocation can slip
309 * between that pair, there could only happen a reselection, which can free a
310 * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes
311 * important: the tag bit must be cleared before 'nr_allocated' is decreased.
312 */
313
314 /* -1 for TAG_NONE is not possible with unsigned char cmd->tag */
315 #undef TAG_NONE
316 #define TAG_NONE 0xff
317
318 /* For the m68k, the number of bits in 'allocated' must be a multiple of 32! */
319 #if (MAX_TAGS % 32) != 0
320 #error "MAX_TAGS must be a multiple of 32!"
321 #endif
322
323 typedef struct {
324 char allocated[MAX_TAGS/8];
325 int nr_allocated;
326 int queue_size;
327 } TAG_ALLOC;
328
329 static TAG_ALLOC TagAlloc[8][8]; /* 8 targets and 8 LUNs */
330
331
init_tags(void)332 static void __init init_tags( void )
333 {
334 int target, lun;
335 TAG_ALLOC *ta;
336
337 if (!setup_use_tagged_queuing)
338 return;
339
340 for( target = 0; target < 8; ++target ) {
341 for( lun = 0; lun < 8; ++lun ) {
342 ta = &TagAlloc[target][lun];
343 memset( &ta->allocated, 0, MAX_TAGS/8 );
344 ta->nr_allocated = 0;
345 /* At the beginning, assume the maximum queue size we could
346 * support (MAX_TAGS). This value will be decreased if the target
347 * returns QUEUE_FULL status.
348 */
349 ta->queue_size = MAX_TAGS;
350 }
351 }
352 }
353
354
355 /* Check if we can issue a command to this LUN: First see if the LUN is marked
356 * busy by an untagged command. If the command should use tagged queuing, also
357 * check that there is a free tag and the target's queue won't overflow. This
358 * function should be called with interrupts disabled to avoid race
359 * conditions.
360 */
361
is_lun_busy(struct scsi_cmnd * cmd,int should_be_tagged)362 static int is_lun_busy(struct scsi_cmnd *cmd, int should_be_tagged)
363 {
364 SETUP_HOSTDATA(cmd->device->host);
365
366 if (hostdata->busy[cmd->device->id] & (1 << cmd->device->lun))
367 return( 1 );
368 if (!should_be_tagged ||
369 !setup_use_tagged_queuing || !cmd->device->tagged_supported)
370 return( 0 );
371 if (TagAlloc[cmd->device->id][cmd->device->lun].nr_allocated >=
372 TagAlloc[cmd->device->id][cmd->device->lun].queue_size ) {
373 TAG_PRINTK( "scsi%d: target %d lun %d: no free tags\n",
374 H_NO(cmd), cmd->device->id, cmd->device->lun );
375 return( 1 );
376 }
377 return( 0 );
378 }
379
380
381 /* Allocate a tag for a command (there are no checks anymore, check_lun_busy()
382 * must be called before!), or reserve the LUN in 'busy' if the command is
383 * untagged.
384 */
385
cmd_get_tag(struct scsi_cmnd * cmd,int should_be_tagged)386 static void cmd_get_tag(struct scsi_cmnd *cmd, int should_be_tagged)
387 {
388 SETUP_HOSTDATA(cmd->device->host);
389
390 /* If we or the target don't support tagged queuing, allocate the LUN for
391 * an untagged command.
392 */
393 if (!should_be_tagged ||
394 !setup_use_tagged_queuing || !cmd->device->tagged_supported) {
395 cmd->tag = TAG_NONE;
396 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
397 TAG_PRINTK( "scsi%d: target %d lun %d now allocated by untagged "
398 "command\n", H_NO(cmd), cmd->device->id, cmd->device->lun );
399 }
400 else {
401 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
402
403 cmd->tag = find_first_zero_bit( &ta->allocated, MAX_TAGS );
404 set_bit( cmd->tag, &ta->allocated );
405 ta->nr_allocated++;
406 TAG_PRINTK( "scsi%d: using tag %d for target %d lun %d "
407 "(now %d tags in use)\n",
408 H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun,
409 ta->nr_allocated );
410 }
411 }
412
413
414 /* Mark the tag of command 'cmd' as free, or in case of an untagged command,
415 * unlock the LUN.
416 */
417
cmd_free_tag(struct scsi_cmnd * cmd)418 static void cmd_free_tag(struct scsi_cmnd *cmd)
419 {
420 SETUP_HOSTDATA(cmd->device->host);
421
422 if (cmd->tag == TAG_NONE) {
423 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
424 TAG_PRINTK( "scsi%d: target %d lun %d untagged cmd finished\n",
425 H_NO(cmd), cmd->device->id, cmd->device->lun );
426 }
427 else if (cmd->tag >= MAX_TAGS) {
428 printk(KERN_NOTICE "scsi%d: trying to free bad tag %d!\n",
429 H_NO(cmd), cmd->tag );
430 }
431 else {
432 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
433 clear_bit( cmd->tag, &ta->allocated );
434 ta->nr_allocated--;
435 TAG_PRINTK( "scsi%d: freed tag %d for target %d lun %d\n",
436 H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun );
437 }
438 }
439
440
free_all_tags(void)441 static void free_all_tags( void )
442 {
443 int target, lun;
444 TAG_ALLOC *ta;
445
446 if (!setup_use_tagged_queuing)
447 return;
448
449 for( target = 0; target < 8; ++target ) {
450 for( lun = 0; lun < 8; ++lun ) {
451 ta = &TagAlloc[target][lun];
452 memset( &ta->allocated, 0, MAX_TAGS/8 );
453 ta->nr_allocated = 0;
454 }
455 }
456 }
457
458 #endif /* SUPPORT_TAGS */
459
460
461 /*
462 * Function: void merge_contiguous_buffers(struct scsi_cmnd *cmd)
463 *
464 * Purpose: Try to merge several scatter-gather requests into one DMA
465 * transfer. This is possible if the scatter buffers lie on
466 * physical contiguous addresses.
467 *
468 * Parameters: struct scsi_cmnd *cmd
469 * The command to work on. The first scatter buffer's data are
470 * assumed to be already transfered into ptr/this_residual.
471 */
472
merge_contiguous_buffers(struct scsi_cmnd * cmd)473 static void merge_contiguous_buffers(struct scsi_cmnd *cmd)
474 {
475 unsigned long endaddr;
476 #if (NDEBUG & NDEBUG_MERGING)
477 unsigned long oldlen = cmd->SCp.this_residual;
478 int cnt = 1;
479 #endif
480
481 for (endaddr = virt_to_phys(cmd->SCp.ptr + cmd->SCp.this_residual - 1) + 1;
482 cmd->SCp.buffers_residual &&
483 virt_to_phys(SGADDR(&(cmd->SCp.buffer[1]))) == endaddr; ) {
484
485 MER_PRINTK("VTOP(%p) == %08lx -> merging\n",
486 SGADDR(&(cmd->SCp.buffer[1])), endaddr);
487 #if (NDEBUG & NDEBUG_MERGING)
488 ++cnt;
489 #endif
490 ++cmd->SCp.buffer;
491 --cmd->SCp.buffers_residual;
492 cmd->SCp.this_residual += cmd->SCp.buffer->length;
493 endaddr += cmd->SCp.buffer->length;
494 }
495 #if (NDEBUG & NDEBUG_MERGING)
496 if (oldlen != cmd->SCp.this_residual)
497 MER_PRINTK("merged %d buffers from %p, new length %08x\n",
498 cnt, cmd->SCp.ptr, cmd->SCp.this_residual);
499 #endif
500 }
501
502 /*
503 * Function : void initialize_SCp(struct scsi_cmnd *cmd)
504 *
505 * Purpose : initialize the saved data pointers for cmd to point to the
506 * start of the buffer.
507 *
508 * Inputs : cmd - struct scsi_cmnd structure to have pointers reset.
509 */
510
initialize_SCp(struct scsi_cmnd * cmd)511 static __inline__ void initialize_SCp(struct scsi_cmnd *cmd)
512 {
513 /*
514 * Initialize the Scsi Pointer field so that all of the commands in the
515 * various queues are valid.
516 */
517
518 if (scsi_bufflen(cmd)) {
519 cmd->SCp.buffer = scsi_sglist(cmd);
520 cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
521 cmd->SCp.ptr = (char *) SGADDR(cmd->SCp.buffer);
522 cmd->SCp.this_residual = cmd->SCp.buffer->length;
523
524 /* ++roman: Try to merge some scatter-buffers if they are at
525 * contiguous physical addresses.
526 */
527 // merge_contiguous_buffers( cmd );
528 } else {
529 cmd->SCp.buffer = NULL;
530 cmd->SCp.buffers_residual = 0;
531 cmd->SCp.ptr = NULL;
532 cmd->SCp.this_residual = 0;
533 }
534
535 }
536
537 #include <linux/delay.h>
538
539 #if 1
540 static struct {
541 unsigned char mask;
542 const char * name;}
543 signals[] = {{ SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" },
544 { SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD, "CD" }, { SR_IO, "IO" },
545 { SR_SEL, "SEL" }, {0, NULL}},
546 basrs[] = {{BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL}},
547 icrs[] = {{ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"},
548 {ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"},
549 {ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"},
550 {0, NULL}},
551 mrs[] = {{MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"},
552 {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR,
553 "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR,"MODE EOP INTR"},
554 {MR_MONITOR_BSY, "MODE MONITOR BSY"},
555 {MR_DMA_MODE, "MODE DMA"}, {MR_ARBITRATE, "MODE ARBITRATION"},
556 {0, NULL}};
557
558 /*
559 * Function : void NCR5380_print(struct Scsi_Host *instance)
560 *
561 * Purpose : print the SCSI bus signals for debugging purposes
562 *
563 * Input : instance - which NCR5380
564 */
565
NCR5380_print(struct Scsi_Host * instance)566 static void NCR5380_print(struct Scsi_Host *instance) {
567 unsigned char status, data, basr, mr, icr, i;
568 unsigned long flags;
569
570 local_irq_save(flags);
571 data = NCR5380_read(CURRENT_SCSI_DATA_REG);
572 status = NCR5380_read(STATUS_REG);
573 mr = NCR5380_read(MODE_REG);
574 icr = NCR5380_read(INITIATOR_COMMAND_REG);
575 basr = NCR5380_read(BUS_AND_STATUS_REG);
576 local_irq_restore(flags);
577 printk("STATUS_REG: %02x ", status);
578 for (i = 0; signals[i].mask ; ++i)
579 if (status & signals[i].mask)
580 printk(",%s", signals[i].name);
581 printk("\nBASR: %02x ", basr);
582 for (i = 0; basrs[i].mask ; ++i)
583 if (basr & basrs[i].mask)
584 printk(",%s", basrs[i].name);
585 printk("\nICR: %02x ", icr);
586 for (i = 0; icrs[i].mask; ++i)
587 if (icr & icrs[i].mask)
588 printk(",%s", icrs[i].name);
589 printk("\nMODE: %02x ", mr);
590 for (i = 0; mrs[i].mask; ++i)
591 if (mr & mrs[i].mask)
592 printk(",%s", mrs[i].name);
593 printk("\n");
594 }
595
596 static struct {
597 unsigned char value;
598 const char *name;
599 } phases[] = {
600 {PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"},
601 {PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"},
602 {PHASE_UNKNOWN, "UNKNOWN"}};
603
604 /*
605 * Function : void NCR5380_print_phase(struct Scsi_Host *instance)
606 *
607 * Purpose : print the current SCSI phase for debugging purposes
608 *
609 * Input : instance - which NCR5380
610 */
611
NCR5380_print_phase(struct Scsi_Host * instance)612 static void NCR5380_print_phase(struct Scsi_Host *instance)
613 {
614 unsigned char status;
615 int i;
616
617 status = NCR5380_read(STATUS_REG);
618 if (!(status & SR_REQ))
619 printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO);
620 else {
621 for (i = 0; (phases[i].value != PHASE_UNKNOWN) &&
622 (phases[i].value != (status & PHASE_MASK)); ++i);
623 printk(KERN_DEBUG "scsi%d: phase %s\n", HOSTNO, phases[i].name);
624 }
625 }
626
627 #else /* !NDEBUG */
628
629 /* dummies... */
NCR5380_print(struct Scsi_Host * instance)630 __inline__ void NCR5380_print(struct Scsi_Host *instance) { };
NCR5380_print_phase(struct Scsi_Host * instance)631 __inline__ void NCR5380_print_phase(struct Scsi_Host *instance) { };
632
633 #endif
634
635 /*
636 * ++roman: New scheme of calling NCR5380_main()
637 *
638 * If we're not in an interrupt, we can call our main directly, it cannot be
639 * already running. Else, we queue it on a task queue, if not 'main_running'
640 * tells us that a lower level is already executing it. This way,
641 * 'main_running' needs not be protected in a special way.
642 *
643 * queue_main() is a utility function for putting our main onto the task
644 * queue, if main_running is false. It should be called only from a
645 * interrupt or bottom half.
646 */
647
648 #include <linux/workqueue.h>
649 #include <linux/interrupt.h>
650
651 static volatile int main_running = 0;
652 static DECLARE_WORK(NCR5380_tqueue, NCR5380_main);
653
queue_main(void)654 static __inline__ void queue_main(void)
655 {
656 if (!main_running) {
657 /* If in interrupt and NCR5380_main() not already running,
658 queue it on the 'immediate' task queue, to be processed
659 immediately after the current interrupt processing has
660 finished. */
661 schedule_work(&NCR5380_tqueue);
662 }
663 /* else: nothing to do: the running NCR5380_main() will pick up
664 any newly queued command. */
665 }
666
667
NCR5380_all_init(void)668 static inline void NCR5380_all_init (void)
669 {
670 static int done = 0;
671 if (!done) {
672 INI_PRINTK("scsi : NCR5380_all_init()\n");
673 done = 1;
674 }
675 }
676
677
678 /*
679 * Function : void NCR58380_print_options (struct Scsi_Host *instance)
680 *
681 * Purpose : called by probe code indicating the NCR5380 driver
682 * options that were selected.
683 *
684 * Inputs : instance, pointer to this instance. Unused.
685 */
686
NCR5380_print_options(struct Scsi_Host * instance)687 static void __init NCR5380_print_options (struct Scsi_Host *instance)
688 {
689 printk(" generic options"
690 #ifdef AUTOSENSE
691 " AUTOSENSE"
692 #endif
693 #ifdef REAL_DMA
694 " REAL DMA"
695 #endif
696 #ifdef PARITY
697 " PARITY"
698 #endif
699 #ifdef SUPPORT_TAGS
700 " SCSI-2 TAGGED QUEUING"
701 #endif
702 );
703 printk(" generic release=%d", NCR5380_PUBLIC_RELEASE);
704 }
705
706 /*
707 * Function : void NCR5380_print_status (struct Scsi_Host *instance)
708 *
709 * Purpose : print commands in the various queues, called from
710 * NCR5380_abort and NCR5380_debug to aid debugging.
711 *
712 * Inputs : instance, pointer to this instance.
713 */
714
NCR5380_print_status(struct Scsi_Host * instance)715 static void NCR5380_print_status (struct Scsi_Host *instance)
716 {
717 char *pr_bfr;
718 char *start;
719 int len;
720
721 NCR_PRINT(NDEBUG_ANY);
722 NCR_PRINT_PHASE(NDEBUG_ANY);
723
724 pr_bfr = (char *) __get_free_page(GFP_ATOMIC);
725 if (!pr_bfr) {
726 printk("NCR5380_print_status: no memory for print buffer\n");
727 return;
728 }
729 len = NCR5380_proc_info(instance, pr_bfr, &start, 0, PAGE_SIZE, 0);
730 pr_bfr[len] = 0;
731 printk("\n%s\n", pr_bfr);
732 free_page((unsigned long) pr_bfr);
733 }
734
735
736 /******************************************/
737 /*
738 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED]
739 *
740 * *buffer: I/O buffer
741 * **start: if inout == FALSE pointer into buffer where user read should start
742 * offset: current offset
743 * length: length of buffer
744 * hostno: Scsi_Host host_no
745 * inout: TRUE - user is writing; FALSE - user is reading
746 *
747 * Return the number of bytes read from or written
748 */
749
750 #undef SPRINTF
751 #define SPRINTF(fmt,args...) \
752 do { if (pos + strlen(fmt) + 20 /* slop */ < buffer + length) \
753 pos += sprintf(pos, fmt , ## args); } while(0)
754 static
755 char *lprint_Scsi_Cmnd(struct scsi_cmnd *cmd, char *pos, char *buffer,
756 int length);
757
NCR5380_proc_info(struct Scsi_Host * instance,char * buffer,char ** start,off_t offset,int length,int inout)758 static int NCR5380_proc_info(struct Scsi_Host *instance, char *buffer,
759 char **start, off_t offset, int length, int inout)
760 {
761 char *pos = buffer;
762 struct NCR5380_hostdata *hostdata;
763 struct scsi_cmnd *ptr;
764 unsigned long flags;
765 off_t begin = 0;
766 #define check_offset() \
767 do { \
768 if (pos - buffer < offset - begin) { \
769 begin += pos - buffer; \
770 pos = buffer; \
771 } \
772 } while (0)
773
774 hostdata = (struct NCR5380_hostdata *)instance->hostdata;
775
776 if (inout) { /* Has data been written to the file ? */
777 return(-ENOSYS); /* Currently this is a no-op */
778 }
779 SPRINTF("NCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE);
780 check_offset();
781 local_irq_save(flags);
782 SPRINTF("NCR5380: coroutine is%s running.\n", main_running ? "" : "n't");
783 check_offset();
784 if (!hostdata->connected)
785 SPRINTF("scsi%d: no currently connected command\n", HOSTNO);
786 else
787 pos = lprint_Scsi_Cmnd ((struct scsi_cmnd *) hostdata->connected,
788 pos, buffer, length);
789 SPRINTF("scsi%d: issue_queue\n", HOSTNO);
790 check_offset();
791 for (ptr = (struct scsi_cmnd *) hostdata->issue_queue; ptr; ptr = NEXT(ptr))
792 {
793 pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length);
794 check_offset();
795 }
796
797 SPRINTF("scsi%d: disconnected_queue\n", HOSTNO);
798 check_offset();
799 for (ptr = (struct scsi_cmnd *) hostdata->disconnected_queue; ptr;
800 ptr = NEXT(ptr)) {
801 pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length);
802 check_offset();
803 }
804
805 local_irq_restore(flags);
806 *start = buffer + (offset - begin);
807 if (pos - buffer < offset - begin)
808 return 0;
809 else if (pos - buffer - (offset - begin) < length)
810 return pos - buffer - (offset - begin);
811 return length;
812 }
813
lprint_Scsi_Cmnd(struct scsi_cmnd * cmd,char * pos,char * buffer,int length)814 static char *lprint_Scsi_Cmnd(struct scsi_cmnd *cmd, char *pos, char *buffer,
815 int length)
816 {
817 int i, s;
818 unsigned char *command;
819 SPRINTF("scsi%d: destination target %d, lun %d\n",
820 H_NO(cmd), cmd->device->id, cmd->device->lun);
821 SPRINTF(" command = ");
822 command = cmd->cmnd;
823 SPRINTF("%2d (0x%02x)", command[0], command[0]);
824 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
825 SPRINTF(" %02x", command[i]);
826 SPRINTF("\n");
827 return pos;
828 }
829
830
831 /*
832 * Function : void NCR5380_init (struct Scsi_Host *instance)
833 *
834 * Purpose : initializes *instance and corresponding 5380 chip.
835 *
836 * Inputs : instance - instantiation of the 5380 driver.
837 *
838 * Notes : I assume that the host, hostno, and id bits have been
839 * set correctly. I don't care about the irq and other fields.
840 *
841 */
842
NCR5380_init(struct Scsi_Host * instance,int flags)843 static int NCR5380_init (struct Scsi_Host *instance, int flags)
844 {
845 int i;
846 SETUP_HOSTDATA(instance);
847
848 NCR5380_all_init();
849
850 hostdata->aborted = 0;
851 hostdata->id_mask = 1 << instance->this_id;
852 hostdata->id_higher_mask = 0;
853 for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
854 if (i > hostdata->id_mask)
855 hostdata->id_higher_mask |= i;
856 for (i = 0; i < 8; ++i)
857 hostdata->busy[i] = 0;
858 #ifdef SUPPORT_TAGS
859 init_tags();
860 #endif
861 #if defined (REAL_DMA)
862 hostdata->dma_len = 0;
863 #endif
864 hostdata->targets_present = 0;
865 hostdata->connected = NULL;
866 hostdata->issue_queue = NULL;
867 hostdata->disconnected_queue = NULL;
868 hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT;
869
870 if (!the_template) {
871 the_template = instance->hostt;
872 first_instance = instance;
873 }
874
875
876 #ifndef AUTOSENSE
877 if ((instance->cmd_per_lun > 1) || (instance->can_queue > 1))
878 printk("scsi%d: WARNING : support for multiple outstanding commands enabled\n"
879 " without AUTOSENSE option, contingent allegiance conditions may\n"
880 " be incorrectly cleared.\n", HOSTNO);
881 #endif /* def AUTOSENSE */
882
883 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
884 NCR5380_write(MODE_REG, MR_BASE);
885 NCR5380_write(TARGET_COMMAND_REG, 0);
886 NCR5380_write(SELECT_ENABLE_REG, 0);
887
888 return 0;
889 }
890
891 /*
892 * Function : int NCR5380_queue_command (struct scsi_cmnd *cmd,
893 * void (*done)(struct scsi_cmnd *))
894 *
895 * Purpose : enqueues a SCSI command
896 *
897 * Inputs : cmd - SCSI command, done - function called on completion, with
898 * a pointer to the command descriptor.
899 *
900 * Returns : 0
901 *
902 * Side effects :
903 * cmd is added to the per instance issue_queue, with minor
904 * twiddling done to the host specific fields of cmd. If the
905 * main coroutine is not running, it is restarted.
906 *
907 */
908
909 /* Only make static if a wrapper function is used */
NCR5380_queue_command(struct scsi_cmnd * cmd,void (* done)(struct scsi_cmnd *))910 static int NCR5380_queue_command(struct scsi_cmnd *cmd,
911 void (*done)(struct scsi_cmnd *))
912 {
913 SETUP_HOSTDATA(cmd->device->host);
914 struct scsi_cmnd *tmp;
915 unsigned long flags;
916
917 #if (NDEBUG & NDEBUG_NO_WRITE)
918 switch (cmd->cmnd[0]) {
919 case WRITE_6:
920 case WRITE_10:
921 printk(KERN_NOTICE "scsi%d: WRITE attempted with NO_WRITE debugging flag set\n",
922 H_NO(cmd));
923 cmd->result = (DID_ERROR << 16);
924 done(cmd);
925 return 0;
926 }
927 #endif /* (NDEBUG & NDEBUG_NO_WRITE) */
928
929
930 #ifdef NCR5380_STATS
931 # if 0
932 if (!hostdata->connected && !hostdata->issue_queue &&
933 !hostdata->disconnected_queue) {
934 hostdata->timebase = jiffies;
935 }
936 # endif
937 # ifdef NCR5380_STAT_LIMIT
938 if (scsi_bufflen(cmd) > NCR5380_STAT_LIMIT)
939 # endif
940 switch (cmd->cmnd[0])
941 {
942 case WRITE:
943 case WRITE_6:
944 case WRITE_10:
945 hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase);
946 hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);
947 hostdata->pendingw++;
948 break;
949 case READ:
950 case READ_6:
951 case READ_10:
952 hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase);
953 hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);
954 hostdata->pendingr++;
955 break;
956 }
957 #endif
958
959 /*
960 * We use the host_scribble field as a pointer to the next command
961 * in a queue
962 */
963
964 NEXT(cmd) = NULL;
965 cmd->scsi_done = done;
966
967 cmd->result = 0;
968
969
970 /*
971 * Insert the cmd into the issue queue. Note that REQUEST SENSE
972 * commands are added to the head of the queue since any command will
973 * clear the contingent allegiance condition that exists and the
974 * sense data is only guaranteed to be valid while the condition exists.
975 */
976
977 local_irq_save(flags);
978 /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA.
979 * Otherwise a running NCR5380_main may steal the lock.
980 * Lock before actually inserting due to fairness reasons explained in
981 * atari_scsi.c. If we insert first, then it's impossible for this driver
982 * to release the lock.
983 * Stop timer for this command while waiting for the lock, or timeouts
984 * may happen (and they really do), and it's no good if the command doesn't
985 * appear in any of the queues.
986 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
987 * because also a timer int can trigger an abort or reset, which would
988 * alter queues and touch the lock.
989 */
990 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
991 LIST(cmd, hostdata->issue_queue);
992 NEXT(cmd) = hostdata->issue_queue;
993 hostdata->issue_queue = cmd;
994 } else {
995 for (tmp = (struct scsi_cmnd *)hostdata->issue_queue;
996 NEXT(tmp); tmp = NEXT(tmp))
997 ;
998 LIST(cmd, tmp);
999 NEXT(tmp) = cmd;
1000 }
1001
1002 local_irq_restore(flags);
1003
1004 QU_PRINTK("scsi%d: command added to %s of queue\n", H_NO(cmd),
1005 (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail");
1006
1007 /* If queue_command() is called from an interrupt (real one or bottom
1008 * half), we let queue_main() do the job of taking care about main. If it
1009 * is already running, this is a no-op, else main will be queued.
1010 *
1011 * If we're not in an interrupt, we can call NCR5380_main()
1012 * unconditionally, because it cannot be already running.
1013 */
1014 if (in_interrupt() || ((flags >> 8) & 7) >= 6)
1015 queue_main();
1016 else
1017 NCR5380_main(NULL);
1018 return 0;
1019 }
1020
1021 /*
1022 * Function : NCR5380_main (void)
1023 *
1024 * Purpose : NCR5380_main is a coroutine that runs as long as more work can
1025 * be done on the NCR5380 host adapters in a system. Both
1026 * NCR5380_queue_command() and NCR5380_intr() will try to start it
1027 * in case it is not running.
1028 *
1029 * NOTE : NCR5380_main exits with interrupts *disabled*, the caller should
1030 * reenable them. This prevents reentrancy and kernel stack overflow.
1031 */
1032
NCR5380_main(struct work_struct * bl)1033 static void NCR5380_main (struct work_struct *bl)
1034 {
1035 struct scsi_cmnd *tmp, *prev;
1036 struct Scsi_Host *instance = first_instance;
1037 struct NCR5380_hostdata *hostdata = HOSTDATA(instance);
1038 int done;
1039 unsigned long flags;
1040
1041 /*
1042 * We run (with interrupts disabled) until we're sure that none of
1043 * the host adapters have anything that can be done, at which point
1044 * we set main_running to 0 and exit.
1045 *
1046 * Interrupts are enabled before doing various other internal
1047 * instructions, after we've decided that we need to run through
1048 * the loop again.
1049 *
1050 * this should prevent any race conditions.
1051 *
1052 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
1053 * because also a timer int can trigger an abort or reset, which can
1054 * alter queues and touch the Falcon lock.
1055 */
1056
1057 /* Tell int handlers main() is now already executing. Note that
1058 no races are possible here. If an int comes in before
1059 'main_running' is set here, and queues/executes main via the
1060 task queue, it doesn't do any harm, just this instance of main
1061 won't find any work left to do. */
1062 if (main_running)
1063 return;
1064 main_running = 1;
1065
1066 local_save_flags(flags);
1067 do {
1068 local_irq_disable(); /* Freeze request queues */
1069 done = 1;
1070
1071 if (!hostdata->connected) {
1072 MAIN_PRINTK( "scsi%d: not connected\n", HOSTNO );
1073 /*
1074 * Search through the issue_queue for a command destined
1075 * for a target that's not busy.
1076 */
1077 #if (NDEBUG & NDEBUG_LISTS)
1078 for (tmp = (struct scsi_cmnd *) hostdata->issue_queue, prev = NULL;
1079 tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp))
1080 ;
1081 if ((tmp == prev) && tmp) printk(" LOOP\n");/* else printk("\n");*/
1082 #endif
1083 for (tmp = (struct scsi_cmnd *) hostdata->issue_queue,
1084 prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp) ) {
1085
1086 #if (NDEBUG & NDEBUG_LISTS)
1087 if (prev != tmp)
1088 printk("MAIN tmp=%p target=%d busy=%d lun=%d\n",
1089 tmp, tmp->target, hostdata->busy[tmp->target],
1090 tmp->lun);
1091 #endif
1092 /* When we find one, remove it from the issue queue. */
1093 /* ++guenther: possible race with Falcon locking */
1094 if (
1095 #ifdef SUPPORT_TAGS
1096 !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE)
1097 #else
1098 !(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))
1099 #endif
1100 ) {
1101 /* ++guenther: just to be sure, this must be atomic */
1102 local_irq_disable();
1103 if (prev) {
1104 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
1105 NEXT(prev) = NEXT(tmp);
1106 } else {
1107 REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp));
1108 hostdata->issue_queue = NEXT(tmp);
1109 }
1110 NEXT(tmp) = NULL;
1111
1112 /* reenable interrupts after finding one */
1113 local_irq_restore(flags);
1114
1115 /*
1116 * Attempt to establish an I_T_L nexus here.
1117 * On success, instance->hostdata->connected is set.
1118 * On failure, we must add the command back to the
1119 * issue queue so we can keep trying.
1120 */
1121 MAIN_PRINTK("scsi%d: main(): command for target %d "
1122 "lun %d removed from issue_queue\n",
1123 HOSTNO, tmp->target, tmp->lun);
1124 /*
1125 * REQUEST SENSE commands are issued without tagged
1126 * queueing, even on SCSI-II devices because the
1127 * contingent allegiance condition exists for the
1128 * entire unit.
1129 */
1130 /* ++roman: ...and the standard also requires that
1131 * REQUEST SENSE command are untagged.
1132 */
1133
1134 #ifdef SUPPORT_TAGS
1135 cmd_get_tag( tmp, tmp->cmnd[0] != REQUEST_SENSE );
1136 #endif
1137 if (!NCR5380_select(instance, tmp,
1138 (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE :
1139 TAG_NEXT)) {
1140 break;
1141 } else {
1142 local_irq_disable();
1143 LIST(tmp, hostdata->issue_queue);
1144 NEXT(tmp) = hostdata->issue_queue;
1145 hostdata->issue_queue = tmp;
1146 #ifdef SUPPORT_TAGS
1147 cmd_free_tag( tmp );
1148 #endif
1149 local_irq_restore(flags);
1150 MAIN_PRINTK("scsi%d: main(): select() failed, "
1151 "returned to issue_queue\n", HOSTNO);
1152 if (hostdata->connected)
1153 break;
1154 }
1155 } /* if target/lun/target queue is not busy */
1156 } /* for issue_queue */
1157 } /* if (!hostdata->connected) */
1158 if (hostdata->connected
1159 #ifdef REAL_DMA
1160 && !hostdata->dma_len
1161 #endif
1162 ) {
1163 local_irq_restore(flags);
1164 MAIN_PRINTK("scsi%d: main: performing information transfer\n",
1165 HOSTNO);
1166 NCR5380_information_transfer(instance);
1167 MAIN_PRINTK("scsi%d: main: done set false\n", HOSTNO);
1168 done = 0;
1169 }
1170 } while (!done);
1171
1172 /* Better allow ints _after_ 'main_running' has been cleared, else
1173 an interrupt could believe we'll pick up the work it left for
1174 us, but we won't see it anymore here... */
1175 main_running = 0;
1176 local_irq_restore(flags);
1177 }
1178
1179
1180 #ifdef REAL_DMA
1181 /*
1182 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
1183 *
1184 * Purpose : Called by interrupt handler when DMA finishes or a phase
1185 * mismatch occurs (which would finish the DMA transfer).
1186 *
1187 * Inputs : instance - this instance of the NCR5380.
1188 *
1189 */
1190
NCR5380_dma_complete(struct Scsi_Host * instance)1191 static void NCR5380_dma_complete( struct Scsi_Host *instance )
1192 {
1193 SETUP_HOSTDATA(instance);
1194 int transfered;
1195 unsigned char **data;
1196 volatile int *count;
1197
1198 if (!hostdata->connected) {
1199 printk(KERN_WARNING "scsi%d: received end of DMA interrupt with "
1200 "no connected cmd\n", HOSTNO);
1201 return;
1202 }
1203
1204 DMA_PRINTK("scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n",
1205 HOSTNO, NCR5380_read(BUS_AND_STATUS_REG),
1206 NCR5380_read(STATUS_REG));
1207
1208 if((sun3scsi_dma_finish(rq_data_dir(hostdata->connected->request)))) {
1209 printk("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n", HOSTNO);
1210 printk("please e-mail sammy@sammy.net with a description of how this\n");
1211 printk("error was produced.\n");
1212 BUG();
1213 }
1214
1215 /* make sure we're not stuck in a data phase */
1216 if((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH |
1217 BASR_ACK)) ==
1218 (BASR_PHASE_MATCH | BASR_ACK)) {
1219 printk("scsi%d: BASR %02x\n", HOSTNO, NCR5380_read(BUS_AND_STATUS_REG));
1220 printk("scsi%d: bus stuck in data phase -- probably a single byte "
1221 "overrun!\n", HOSTNO);
1222 printk("not prepared for this error!\n");
1223 printk("please e-mail sammy@sammy.net with a description of how this\n");
1224 printk("error was produced.\n");
1225 BUG();
1226 }
1227
1228
1229
1230 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1231 NCR5380_write(MODE_REG, MR_BASE);
1232 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1233
1234 transfered = hostdata->dma_len - NCR5380_dma_residual(instance);
1235 hostdata->dma_len = 0;
1236
1237 data = (unsigned char **) &(hostdata->connected->SCp.ptr);
1238 count = &(hostdata->connected->SCp.this_residual);
1239 *data += transfered;
1240 *count -= transfered;
1241
1242 }
1243 #endif /* REAL_DMA */
1244
1245
1246 /*
1247 * Function : void NCR5380_intr (int irq)
1248 *
1249 * Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1250 * from the disconnected queue, and restarting NCR5380_main()
1251 * as required.
1252 *
1253 * Inputs : int irq, irq that caused this interrupt.
1254 *
1255 */
1256
NCR5380_intr(int irq,void * dev_id)1257 static irqreturn_t NCR5380_intr (int irq, void *dev_id)
1258 {
1259 struct Scsi_Host *instance = first_instance;
1260 int done = 1, handled = 0;
1261 unsigned char basr;
1262
1263 INT_PRINTK("scsi%d: NCR5380 irq triggered\n", HOSTNO);
1264
1265 /* Look for pending interrupts */
1266 basr = NCR5380_read(BUS_AND_STATUS_REG);
1267 INT_PRINTK("scsi%d: BASR=%02x\n", HOSTNO, basr);
1268 /* dispatch to appropriate routine if found and done=0 */
1269 if (basr & BASR_IRQ) {
1270 NCR_PRINT(NDEBUG_INTR);
1271 if ((NCR5380_read(STATUS_REG) & (SR_SEL|SR_IO)) == (SR_SEL|SR_IO)) {
1272 done = 0;
1273 // ENABLE_IRQ();
1274 INT_PRINTK("scsi%d: SEL interrupt\n", HOSTNO);
1275 NCR5380_reselect(instance);
1276 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1277 }
1278 else if (basr & BASR_PARITY_ERROR) {
1279 INT_PRINTK("scsi%d: PARITY interrupt\n", HOSTNO);
1280 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1281 }
1282 else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
1283 INT_PRINTK("scsi%d: RESET interrupt\n", HOSTNO);
1284 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1285 }
1286 else {
1287 /*
1288 * The rest of the interrupt conditions can occur only during a
1289 * DMA transfer
1290 */
1291
1292 #if defined(REAL_DMA)
1293 /*
1294 * We should only get PHASE MISMATCH and EOP interrupts if we have
1295 * DMA enabled, so do a sanity check based on the current setting
1296 * of the MODE register.
1297 */
1298
1299 if ((NCR5380_read(MODE_REG) & MR_DMA_MODE) &&
1300 ((basr & BASR_END_DMA_TRANSFER) ||
1301 !(basr & BASR_PHASE_MATCH))) {
1302
1303 INT_PRINTK("scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO);
1304 NCR5380_dma_complete( instance );
1305 done = 0;
1306 // ENABLE_IRQ();
1307 } else
1308 #endif /* REAL_DMA */
1309 {
1310 /* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */
1311 if (basr & BASR_PHASE_MATCH)
1312 INT_PRINTK("scsi%d: unknown interrupt, "
1313 "BASR 0x%x, MR 0x%x, SR 0x%x\n",
1314 HOSTNO, basr, NCR5380_read(MODE_REG),
1315 NCR5380_read(STATUS_REG));
1316 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1317 #ifdef SUN3_SCSI_VME
1318 dregs->csr |= CSR_DMA_ENABLE;
1319 #endif
1320 }
1321 } /* if !(SELECTION || PARITY) */
1322 handled = 1;
1323 } /* BASR & IRQ */
1324 else {
1325
1326 printk(KERN_NOTICE "scsi%d: interrupt without IRQ bit set in BASR, "
1327 "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO, basr,
1328 NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG));
1329 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1330 #ifdef SUN3_SCSI_VME
1331 dregs->csr |= CSR_DMA_ENABLE;
1332 #endif
1333 }
1334
1335 if (!done) {
1336 INT_PRINTK("scsi%d: in int routine, calling main\n", HOSTNO);
1337 /* Put a call to NCR5380_main() on the queue... */
1338 queue_main();
1339 }
1340 return IRQ_RETVAL(handled);
1341 }
1342
1343 #ifdef NCR5380_STATS
collect_stats(struct NCR5380_hostdata * hostdata,struct scsi_cmnd * cmd)1344 static void collect_stats(struct NCR5380_hostdata *hostdata,
1345 struct scsi_cmnd *cmd)
1346 {
1347 # ifdef NCR5380_STAT_LIMIT
1348 if (scsi_bufflen(cmd) > NCR5380_STAT_LIMIT)
1349 # endif
1350 switch (cmd->cmnd[0])
1351 {
1352 case WRITE:
1353 case WRITE_6:
1354 case WRITE_10:
1355 hostdata->time_write[cmd->device->id] += (jiffies - hostdata->timebase);
1356 /*hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);*/
1357 hostdata->pendingw--;
1358 break;
1359 case READ:
1360 case READ_6:
1361 case READ_10:
1362 hostdata->time_read[cmd->device->id] += (jiffies - hostdata->timebase);
1363 /*hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);*/
1364 hostdata->pendingr--;
1365 break;
1366 }
1367 }
1368 #endif
1369
1370 /*
1371 * Function : int NCR5380_select(struct Scsi_Host *instance,
1372 * struct scsi_cmnd *cmd, int tag);
1373 *
1374 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1375 * including ARBITRATION, SELECTION, and initial message out for
1376 * IDENTIFY and queue messages.
1377 *
1378 * Inputs : instance - instantiation of the 5380 driver on which this
1379 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for
1380 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for
1381 * the command that is presently connected.
1382 *
1383 * Returns : -1 if selection could not execute for some reason,
1384 * 0 if selection succeeded or failed because the target
1385 * did not respond.
1386 *
1387 * Side effects :
1388 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
1389 * with registers as they should have been on entry - ie
1390 * SELECT_ENABLE will be set appropriately, the NCR5380
1391 * will cease to drive any SCSI bus signals.
1392 *
1393 * If successful : I_T_L or I_T_L_Q nexus will be established,
1394 * instance->connected will be set to cmd.
1395 * SELECT interrupt will be disabled.
1396 *
1397 * If failed (no target) : cmd->scsi_done() will be called, and the
1398 * cmd->result host byte set to DID_BAD_TARGET.
1399 */
1400
NCR5380_select(struct Scsi_Host * instance,struct scsi_cmnd * cmd,int tag)1401 static int NCR5380_select(struct Scsi_Host *instance, struct scsi_cmnd *cmd,
1402 int tag)
1403 {
1404 SETUP_HOSTDATA(instance);
1405 unsigned char tmp[3], phase;
1406 unsigned char *data;
1407 int len;
1408 unsigned long timeout;
1409 unsigned long flags;
1410
1411 hostdata->restart_select = 0;
1412 NCR_PRINT(NDEBUG_ARBITRATION);
1413 ARB_PRINTK("scsi%d: starting arbitration, id = %d\n", HOSTNO,
1414 instance->this_id);
1415
1416 /*
1417 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1418 * data bus during SELECTION.
1419 */
1420
1421 local_irq_save(flags);
1422 if (hostdata->connected) {
1423 local_irq_restore(flags);
1424 return -1;
1425 }
1426 NCR5380_write(TARGET_COMMAND_REG, 0);
1427
1428
1429 /*
1430 * Start arbitration.
1431 */
1432
1433 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
1434 NCR5380_write(MODE_REG, MR_ARBITRATE);
1435
1436 local_irq_restore(flags);
1437
1438 /* Wait for arbitration logic to complete */
1439 #if NCR_TIMEOUT
1440 {
1441 unsigned long timeout = jiffies + 2*NCR_TIMEOUT;
1442
1443 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS)
1444 && time_before(jiffies, timeout) && !hostdata->connected)
1445 ;
1446 if (time_after_eq(jiffies, timeout))
1447 {
1448 printk("scsi : arbitration timeout at %d\n", __LINE__);
1449 NCR5380_write(MODE_REG, MR_BASE);
1450 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1451 return -1;
1452 }
1453 }
1454 #else /* NCR_TIMEOUT */
1455 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS)
1456 && !hostdata->connected);
1457 #endif
1458
1459 ARB_PRINTK("scsi%d: arbitration complete\n", HOSTNO);
1460
1461 if (hostdata->connected) {
1462 NCR5380_write(MODE_REG, MR_BASE);
1463 return -1;
1464 }
1465 /*
1466 * The arbitration delay is 2.2us, but this is a minimum and there is
1467 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1468 * the integral nature of udelay().
1469 *
1470 */
1471
1472 udelay(3);
1473
1474 /* Check for lost arbitration */
1475 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1476 (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) ||
1477 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1478 hostdata->connected) {
1479 NCR5380_write(MODE_REG, MR_BASE);
1480 ARB_PRINTK("scsi%d: lost arbitration, deasserting MR_ARBITRATE\n",
1481 HOSTNO);
1482 return -1;
1483 }
1484
1485 /* after/during arbitration, BSY should be asserted.
1486 IBM DPES-31080 Version S31Q works now */
1487 /* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */
1488 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL |
1489 ICR_ASSERT_BSY ) ;
1490
1491 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1492 hostdata->connected) {
1493 NCR5380_write(MODE_REG, MR_BASE);
1494 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1495 ARB_PRINTK("scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n",
1496 HOSTNO);
1497 return -1;
1498 }
1499
1500 /*
1501 * Again, bus clear + bus settle time is 1.2us, however, this is
1502 * a minimum so we'll udelay ceil(1.2)
1503 */
1504
1505 #ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY
1506 /* ++roman: But some targets (see above :-) seem to need a bit more... */
1507 udelay(15);
1508 #else
1509 udelay(2);
1510 #endif
1511
1512 if (hostdata->connected) {
1513 NCR5380_write(MODE_REG, MR_BASE);
1514 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1515 return -1;
1516 }
1517
1518 ARB_PRINTK("scsi%d: won arbitration\n", HOSTNO);
1519
1520 /*
1521 * Now that we have won arbitration, start Selection process, asserting
1522 * the host and target ID's on the SCSI bus.
1523 */
1524
1525 NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id)));
1526
1527 /*
1528 * Raise ATN while SEL is true before BSY goes false from arbitration,
1529 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1530 * phase immediately after selection.
1531 */
1532
1533 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY |
1534 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL ));
1535 NCR5380_write(MODE_REG, MR_BASE);
1536
1537 /*
1538 * Reselect interrupts must be turned off prior to the dropping of BSY,
1539 * otherwise we will trigger an interrupt.
1540 */
1541
1542 if (hostdata->connected) {
1543 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1544 return -1;
1545 }
1546
1547 NCR5380_write(SELECT_ENABLE_REG, 0);
1548
1549 /*
1550 * The initiator shall then wait at least two deskew delays and release
1551 * the BSY signal.
1552 */
1553 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
1554
1555 /* Reset BSY */
1556 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA |
1557 ICR_ASSERT_ATN | ICR_ASSERT_SEL));
1558
1559 /*
1560 * Something weird happens when we cease to drive BSY - looks
1561 * like the board/chip is letting us do another read before the
1562 * appropriate propagation delay has expired, and we're confusing
1563 * a BSY signal from ourselves as the target's response to SELECTION.
1564 *
1565 * A small delay (the 'C++' frontend breaks the pipeline with an
1566 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1567 * tighter 'C' code breaks and requires this) solves the problem -
1568 * the 1 us delay is arbitrary, and only used because this delay will
1569 * be the same on other platforms and since it works here, it should
1570 * work there.
1571 *
1572 * wingel suggests that this could be due to failing to wait
1573 * one deskew delay.
1574 */
1575
1576 udelay(1);
1577
1578 SEL_PRINTK("scsi%d: selecting target %d\n", HOSTNO, cmd->device->id);
1579
1580 /*
1581 * The SCSI specification calls for a 250 ms timeout for the actual
1582 * selection.
1583 */
1584
1585 timeout = jiffies + 25;
1586
1587 /*
1588 * XXX very interesting - we're seeing a bounce where the BSY we
1589 * asserted is being reflected / still asserted (propagation delay?)
1590 * and it's detecting as true. Sigh.
1591 */
1592
1593 #if 0
1594 /* ++roman: If a target conformed to the SCSI standard, it wouldn't assert
1595 * IO while SEL is true. But again, there are some disks out the in the
1596 * world that do that nevertheless. (Somebody claimed that this announces
1597 * reselection capability of the target.) So we better skip that test and
1598 * only wait for BSY... (Famous german words: Der Klügere gibt nach :-)
1599 */
1600
1601 while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) &
1602 (SR_BSY | SR_IO)));
1603
1604 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) ==
1605 (SR_SEL | SR_IO)) {
1606 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1607 NCR5380_reselect(instance);
1608 printk (KERN_ERR "scsi%d: reselection after won arbitration?\n",
1609 HOSTNO);
1610 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1611 return -1;
1612 }
1613 #else
1614 while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & SR_BSY));
1615 #endif
1616
1617 /*
1618 * No less than two deskew delays after the initiator detects the
1619 * BSY signal is true, it shall release the SEL signal and may
1620 * change the DATA BUS. -wingel
1621 */
1622
1623 udelay(1);
1624
1625 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1626
1627 if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
1628 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1629 if (hostdata->targets_present & (1 << cmd->device->id)) {
1630 printk(KERN_ERR "scsi%d: weirdness\n", HOSTNO);
1631 if (hostdata->restart_select)
1632 printk(KERN_NOTICE "\trestart select\n");
1633 NCR_PRINT(NDEBUG_ANY);
1634 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1635 return -1;
1636 }
1637 cmd->result = DID_BAD_TARGET << 16;
1638 #ifdef NCR5380_STATS
1639 collect_stats(hostdata, cmd);
1640 #endif
1641 #ifdef SUPPORT_TAGS
1642 cmd_free_tag( cmd );
1643 #endif
1644 cmd->scsi_done(cmd);
1645 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1646 SEL_PRINTK("scsi%d: target did not respond within 250ms\n", HOSTNO);
1647 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1648 return 0;
1649 }
1650
1651 hostdata->targets_present |= (1 << cmd->device->id);
1652
1653 /*
1654 * Since we followed the SCSI spec, and raised ATN while SEL
1655 * was true but before BSY was false during selection, the information
1656 * transfer phase should be a MESSAGE OUT phase so that we can send the
1657 * IDENTIFY message.
1658 *
1659 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1660 * message (2 bytes) with a tag ID that we increment with every command
1661 * until it wraps back to 0.
1662 *
1663 * XXX - it turns out that there are some broken SCSI-II devices,
1664 * which claim to support tagged queuing but fail when more than
1665 * some number of commands are issued at once.
1666 */
1667
1668 /* Wait for start of REQ/ACK handshake */
1669 while (!(NCR5380_read(STATUS_REG) & SR_REQ));
1670
1671 SEL_PRINTK("scsi%d: target %d selected, going into MESSAGE OUT phase.\n",
1672 HOSTNO, cmd->device->id);
1673 tmp[0] = IDENTIFY(1, cmd->device->lun);
1674
1675 #ifdef SUPPORT_TAGS
1676 if (cmd->tag != TAG_NONE) {
1677 tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG;
1678 tmp[2] = cmd->tag;
1679 len = 3;
1680 } else
1681 len = 1;
1682 #else
1683 len = 1;
1684 cmd->tag=0;
1685 #endif /* SUPPORT_TAGS */
1686
1687 /* Send message(s) */
1688 data = tmp;
1689 phase = PHASE_MSGOUT;
1690 NCR5380_transfer_pio(instance, &phase, &len, &data);
1691 SEL_PRINTK("scsi%d: nexus established.\n", HOSTNO);
1692 /* XXX need to handle errors here */
1693 hostdata->connected = cmd;
1694 #ifndef SUPPORT_TAGS
1695 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
1696 #endif
1697 #ifdef SUN3_SCSI_VME
1698 dregs->csr |= CSR_INTR;
1699 #endif
1700 initialize_SCp(cmd);
1701
1702
1703 return 0;
1704 }
1705
1706 /*
1707 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
1708 * unsigned char *phase, int *count, unsigned char **data)
1709 *
1710 * Purpose : transfers data in given phase using polled I/O
1711 *
1712 * Inputs : instance - instance of driver, *phase - pointer to
1713 * what phase is expected, *count - pointer to number of
1714 * bytes to transfer, **data - pointer to data pointer.
1715 *
1716 * Returns : -1 when different phase is entered without transferring
1717 * maximum number of bytes, 0 if all bytes are transfered or exit
1718 * is in same phase.
1719 *
1720 * Also, *phase, *count, *data are modified in place.
1721 *
1722 * XXX Note : handling for bus free may be useful.
1723 */
1724
1725 /*
1726 * Note : this code is not as quick as it could be, however it
1727 * IS 100% reliable, and for the actual data transfer where speed
1728 * counts, we will always do a pseudo DMA or DMA transfer.
1729 */
1730
NCR5380_transfer_pio(struct Scsi_Host * instance,unsigned char * phase,int * count,unsigned char ** data)1731 static int NCR5380_transfer_pio( struct Scsi_Host *instance,
1732 unsigned char *phase, int *count,
1733 unsigned char **data)
1734 {
1735 register unsigned char p = *phase, tmp;
1736 register int c = *count;
1737 register unsigned char *d = *data;
1738
1739 /*
1740 * The NCR5380 chip will only drive the SCSI bus when the
1741 * phase specified in the appropriate bits of the TARGET COMMAND
1742 * REGISTER match the STATUS REGISTER
1743 */
1744
1745 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1746
1747 do {
1748 /*
1749 * Wait for assertion of REQ, after which the phase bits will be
1750 * valid
1751 */
1752 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ));
1753
1754 HSH_PRINTK("scsi%d: REQ detected\n", HOSTNO);
1755
1756 /* Check for phase mismatch */
1757 if ((tmp & PHASE_MASK) != p) {
1758 PIO_PRINTK("scsi%d: phase mismatch\n", HOSTNO);
1759 NCR_PRINT_PHASE(NDEBUG_PIO);
1760 break;
1761 }
1762
1763 /* Do actual transfer from SCSI bus to / from memory */
1764 if (!(p & SR_IO))
1765 NCR5380_write(OUTPUT_DATA_REG, *d);
1766 else
1767 *d = NCR5380_read(CURRENT_SCSI_DATA_REG);
1768
1769 ++d;
1770
1771 /*
1772 * The SCSI standard suggests that in MSGOUT phase, the initiator
1773 * should drop ATN on the last byte of the message phase
1774 * after REQ has been asserted for the handshake but before
1775 * the initiator raises ACK.
1776 */
1777
1778 if (!(p & SR_IO)) {
1779 if (!((p & SR_MSG) && c > 1)) {
1780 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1781 ICR_ASSERT_DATA);
1782 NCR_PRINT(NDEBUG_PIO);
1783 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1784 ICR_ASSERT_DATA | ICR_ASSERT_ACK);
1785 } else {
1786 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1787 ICR_ASSERT_DATA | ICR_ASSERT_ATN);
1788 NCR_PRINT(NDEBUG_PIO);
1789 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1790 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1791 }
1792 } else {
1793 NCR_PRINT(NDEBUG_PIO);
1794 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
1795 }
1796
1797 while (NCR5380_read(STATUS_REG) & SR_REQ);
1798
1799 HSH_PRINTK("scsi%d: req false, handshake complete\n", HOSTNO);
1800
1801 /*
1802 * We have several special cases to consider during REQ/ACK handshaking :
1803 * 1. We were in MSGOUT phase, and we are on the last byte of the
1804 * message. ATN must be dropped as ACK is dropped.
1805 *
1806 * 2. We are in a MSGIN phase, and we are on the last byte of the
1807 * message. We must exit with ACK asserted, so that the calling
1808 * code may raise ATN before dropping ACK to reject the message.
1809 *
1810 * 3. ACK and ATN are clear and the target may proceed as normal.
1811 */
1812 if (!(p == PHASE_MSGIN && c == 1)) {
1813 if (p == PHASE_MSGOUT && c > 1)
1814 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1815 else
1816 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1817 }
1818 } while (--c);
1819
1820 PIO_PRINTK("scsi%d: residual %d\n", HOSTNO, c);
1821
1822 *count = c;
1823 *data = d;
1824 tmp = NCR5380_read(STATUS_REG);
1825 /* The phase read from the bus is valid if either REQ is (already)
1826 * asserted or if ACK hasn't been released yet. The latter is the case if
1827 * we're in MSGIN and all wanted bytes have been received. */
1828 if ((tmp & SR_REQ) || (p == PHASE_MSGIN && c == 0))
1829 *phase = tmp & PHASE_MASK;
1830 else
1831 *phase = PHASE_UNKNOWN;
1832
1833 if (!c || (*phase == p))
1834 return 0;
1835 else
1836 return -1;
1837 }
1838
1839 /*
1840 * Function : do_abort (Scsi_Host *host)
1841 *
1842 * Purpose : abort the currently established nexus. Should only be
1843 * called from a routine which can drop into a
1844 *
1845 * Returns : 0 on success, -1 on failure.
1846 */
1847
do_abort(struct Scsi_Host * host)1848 static int do_abort (struct Scsi_Host *host)
1849 {
1850 unsigned char tmp, *msgptr, phase;
1851 int len;
1852
1853 /* Request message out phase */
1854 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1855
1856 /*
1857 * Wait for the target to indicate a valid phase by asserting
1858 * REQ. Once this happens, we'll have either a MSGOUT phase
1859 * and can immediately send the ABORT message, or we'll have some
1860 * other phase and will have to source/sink data.
1861 *
1862 * We really don't care what value was on the bus or what value
1863 * the target sees, so we just handshake.
1864 */
1865
1866 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ));
1867
1868 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
1869
1870 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
1871 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
1872 ICR_ASSERT_ACK);
1873 while (NCR5380_read(STATUS_REG) & SR_REQ);
1874 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1875 }
1876
1877 tmp = ABORT;
1878 msgptr = &tmp;
1879 len = 1;
1880 phase = PHASE_MSGOUT;
1881 NCR5380_transfer_pio (host, &phase, &len, &msgptr);
1882
1883 /*
1884 * If we got here, and the command completed successfully,
1885 * we're about to go into bus free state.
1886 */
1887
1888 return len ? -1 : 0;
1889 }
1890
1891 #if defined(REAL_DMA)
1892 /*
1893 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
1894 * unsigned char *phase, int *count, unsigned char **data)
1895 *
1896 * Purpose : transfers data in given phase using either real
1897 * or pseudo DMA.
1898 *
1899 * Inputs : instance - instance of driver, *phase - pointer to
1900 * what phase is expected, *count - pointer to number of
1901 * bytes to transfer, **data - pointer to data pointer.
1902 *
1903 * Returns : -1 when different phase is entered without transferring
1904 * maximum number of bytes, 0 if all bytes or transfered or exit
1905 * is in same phase.
1906 *
1907 * Also, *phase, *count, *data are modified in place.
1908 *
1909 */
1910
1911
NCR5380_transfer_dma(struct Scsi_Host * instance,unsigned char * phase,int * count,unsigned char ** data)1912 static int NCR5380_transfer_dma( struct Scsi_Host *instance,
1913 unsigned char *phase, int *count,
1914 unsigned char **data)
1915 {
1916 SETUP_HOSTDATA(instance);
1917 register int c = *count;
1918 register unsigned char p = *phase;
1919 unsigned long flags;
1920
1921 /* sanity check */
1922 if(!sun3_dma_setup_done) {
1923 printk("scsi%d: transfer_dma without setup!\n", HOSTNO);
1924 BUG();
1925 }
1926 hostdata->dma_len = c;
1927
1928 DMA_PRINTK("scsi%d: initializing DMA for %s, %d bytes %s %p\n",
1929 HOSTNO, (p & SR_IO) ? "reading" : "writing",
1930 c, (p & SR_IO) ? "to" : "from", *data);
1931
1932 /* netbsd turns off ints here, why not be safe and do it too */
1933 local_irq_save(flags);
1934
1935 /* send start chain */
1936 sun3scsi_dma_start(c, *data);
1937
1938 if (p & SR_IO) {
1939 NCR5380_write(TARGET_COMMAND_REG, 1);
1940 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1941 NCR5380_write(INITIATOR_COMMAND_REG, 0);
1942 NCR5380_write(MODE_REG, (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR));
1943 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
1944 } else {
1945 NCR5380_write(TARGET_COMMAND_REG, 0);
1946 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1947 NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_DATA);
1948 NCR5380_write(MODE_REG, (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR));
1949 NCR5380_write(START_DMA_SEND_REG, 0);
1950 }
1951
1952 #ifdef SUN3_SCSI_VME
1953 dregs->csr |= CSR_DMA_ENABLE;
1954 #endif
1955
1956 local_irq_restore(flags);
1957
1958 sun3_dma_active = 1;
1959 return 0;
1960 }
1961 #endif /* defined(REAL_DMA) */
1962
1963 /*
1964 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
1965 *
1966 * Purpose : run through the various SCSI phases and do as the target
1967 * directs us to. Operates on the currently connected command,
1968 * instance->connected.
1969 *
1970 * Inputs : instance, instance for which we are doing commands
1971 *
1972 * Side effects : SCSI things happen, the disconnected queue will be
1973 * modified if a command disconnects, *instance->connected will
1974 * change.
1975 *
1976 * XXX Note : we need to watch for bus free or a reset condition here
1977 * to recover from an unexpected bus free condition.
1978 */
1979
NCR5380_information_transfer(struct Scsi_Host * instance)1980 static void NCR5380_information_transfer (struct Scsi_Host *instance)
1981 {
1982 SETUP_HOSTDATA(instance);
1983 unsigned long flags;
1984 unsigned char msgout = NOP;
1985 int sink = 0;
1986 int len;
1987 #if defined(REAL_DMA)
1988 int transfersize;
1989 #endif
1990 unsigned char *data;
1991 unsigned char phase, tmp, extended_msg[10], old_phase=0xff;
1992 struct scsi_cmnd *cmd = (struct scsi_cmnd *) hostdata->connected;
1993
1994 #ifdef SUN3_SCSI_VME
1995 dregs->csr |= CSR_INTR;
1996 #endif
1997
1998 while (1) {
1999 tmp = NCR5380_read(STATUS_REG);
2000 /* We only have a valid SCSI phase when REQ is asserted */
2001 if (tmp & SR_REQ) {
2002 phase = (tmp & PHASE_MASK);
2003 if (phase != old_phase) {
2004 old_phase = phase;
2005 NCR_PRINT_PHASE(NDEBUG_INFORMATION);
2006 }
2007
2008 if(phase == PHASE_CMDOUT) {
2009 void *d;
2010 unsigned long count;
2011
2012 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2013 count = cmd->SCp.buffer->length;
2014 d = SGADDR(cmd->SCp.buffer);
2015 } else {
2016 count = cmd->SCp.this_residual;
2017 d = cmd->SCp.ptr;
2018 }
2019 #ifdef REAL_DMA
2020 /* this command setup for dma yet? */
2021 if((count > SUN3_DMA_MINSIZE) && (sun3_dma_setup_done
2022 != cmd))
2023 {
2024 if(blk_fs_request(cmd->request)) {
2025 sun3scsi_dma_setup(d, count,
2026 rq_data_dir(cmd->request));
2027 sun3_dma_setup_done = cmd;
2028 }
2029 }
2030 #endif
2031 #ifdef SUN3_SCSI_VME
2032 dregs->csr |= CSR_INTR;
2033 #endif
2034 }
2035
2036
2037 if (sink && (phase != PHASE_MSGOUT)) {
2038 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
2039
2040 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
2041 ICR_ASSERT_ACK);
2042 while (NCR5380_read(STATUS_REG) & SR_REQ);
2043 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2044 ICR_ASSERT_ATN);
2045 sink = 0;
2046 continue;
2047 }
2048
2049 switch (phase) {
2050 case PHASE_DATAOUT:
2051 #if (NDEBUG & NDEBUG_NO_DATAOUT)
2052 printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT "
2053 "aborted\n", HOSTNO);
2054 sink = 1;
2055 do_abort(instance);
2056 cmd->result = DID_ERROR << 16;
2057 cmd->scsi_done(cmd);
2058 return;
2059 #endif
2060 case PHASE_DATAIN:
2061 /*
2062 * If there is no room left in the current buffer in the
2063 * scatter-gather list, move onto the next one.
2064 */
2065 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2066 ++cmd->SCp.buffer;
2067 --cmd->SCp.buffers_residual;
2068 cmd->SCp.this_residual = cmd->SCp.buffer->length;
2069 cmd->SCp.ptr = SGADDR(cmd->SCp.buffer);
2070
2071 /* ++roman: Try to merge some scatter-buffers if
2072 * they are at contiguous physical addresses.
2073 */
2074 // merge_contiguous_buffers( cmd );
2075 INF_PRINTK("scsi%d: %d bytes and %d buffers left\n",
2076 HOSTNO, cmd->SCp.this_residual,
2077 cmd->SCp.buffers_residual);
2078 }
2079
2080 /*
2081 * The preferred transfer method is going to be
2082 * PSEUDO-DMA for systems that are strictly PIO,
2083 * since we can let the hardware do the handshaking.
2084 *
2085 * For this to work, we need to know the transfersize
2086 * ahead of time, since the pseudo-DMA code will sit
2087 * in an unconditional loop.
2088 */
2089
2090 /* ++roman: I suggest, this should be
2091 * #if def(REAL_DMA)
2092 * instead of leaving REAL_DMA out.
2093 */
2094
2095 #if defined(REAL_DMA)
2096 // if (!cmd->device->borken &&
2097 if((transfersize =
2098 NCR5380_dma_xfer_len(instance,cmd,phase)) > SUN3_DMA_MINSIZE) {
2099 len = transfersize;
2100 cmd->SCp.phase = phase;
2101
2102 if (NCR5380_transfer_dma(instance, &phase,
2103 &len, (unsigned char **) &cmd->SCp.ptr)) {
2104 /*
2105 * If the watchdog timer fires, all future
2106 * accesses to this device will use the
2107 * polled-IO. */
2108 printk(KERN_NOTICE "scsi%d: switching target %d "
2109 "lun %d to slow handshake\n", HOSTNO,
2110 cmd->device->id, cmd->device->lun);
2111 cmd->device->borken = 1;
2112 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2113 ICR_ASSERT_ATN);
2114 sink = 1;
2115 do_abort(instance);
2116 cmd->result = DID_ERROR << 16;
2117 cmd->scsi_done(cmd);
2118 /* XXX - need to source or sink data here, as appropriate */
2119 } else {
2120 #ifdef REAL_DMA
2121 /* ++roman: When using real DMA,
2122 * information_transfer() should return after
2123 * starting DMA since it has nothing more to
2124 * do.
2125 */
2126 return;
2127 #else
2128 cmd->SCp.this_residual -= transfersize - len;
2129 #endif
2130 }
2131 } else
2132 #endif /* defined(REAL_DMA) */
2133 NCR5380_transfer_pio(instance, &phase,
2134 (int *) &cmd->SCp.this_residual, (unsigned char **)
2135 &cmd->SCp.ptr);
2136 #ifdef REAL_DMA
2137 /* if we had intended to dma that command clear it */
2138 if(sun3_dma_setup_done == cmd)
2139 sun3_dma_setup_done = NULL;
2140 #endif
2141
2142 break;
2143 case PHASE_MSGIN:
2144 len = 1;
2145 data = &tmp;
2146 NCR5380_write(SELECT_ENABLE_REG, 0); /* disable reselects */
2147 NCR5380_transfer_pio(instance, &phase, &len, &data);
2148 cmd->SCp.Message = tmp;
2149
2150 switch (tmp) {
2151 /*
2152 * Linking lets us reduce the time required to get the
2153 * next command out to the device, hopefully this will
2154 * mean we don't waste another revolution due to the delays
2155 * required by ARBITRATION and another SELECTION.
2156 *
2157 * In the current implementation proposal, low level drivers
2158 * merely have to start the next command, pointed to by
2159 * next_link, done() is called as with unlinked commands.
2160 */
2161 #ifdef LINKED
2162 case LINKED_CMD_COMPLETE:
2163 case LINKED_FLG_CMD_COMPLETE:
2164 /* Accept message by clearing ACK */
2165 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2166
2167 LNK_PRINTK("scsi%d: target %d lun %d linked command "
2168 "complete.\n", HOSTNO, cmd->device->id, cmd->device->lun);
2169
2170 /* Enable reselect interrupts */
2171 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2172 /*
2173 * Sanity check : A linked command should only terminate
2174 * with one of these messages if there are more linked
2175 * commands available.
2176 */
2177
2178 if (!cmd->next_link) {
2179 printk(KERN_NOTICE "scsi%d: target %d lun %d "
2180 "linked command complete, no next_link\n",
2181 HOSTNO, cmd->device->id, cmd->device->lun);
2182 sink = 1;
2183 do_abort (instance);
2184 return;
2185 }
2186
2187 initialize_SCp(cmd->next_link);
2188 /* The next command is still part of this process; copy it
2189 * and don't free it! */
2190 cmd->next_link->tag = cmd->tag;
2191 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2192 LNK_PRINTK("scsi%d: target %d lun %d linked request "
2193 "done, calling scsi_done().\n",
2194 HOSTNO, cmd->device->id, cmd->device->lun);
2195 #ifdef NCR5380_STATS
2196 collect_stats(hostdata, cmd);
2197 #endif
2198 cmd->scsi_done(cmd);
2199 cmd = hostdata->connected;
2200 break;
2201 #endif /* def LINKED */
2202 case ABORT:
2203 case COMMAND_COMPLETE:
2204 /* Accept message by clearing ACK */
2205 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2206 hostdata->connected = NULL;
2207 QU_PRINTK("scsi%d: command for target %d, lun %d "
2208 "completed\n", HOSTNO, cmd->device->id, cmd->device->lun);
2209 #ifdef SUPPORT_TAGS
2210 cmd_free_tag( cmd );
2211 if (status_byte(cmd->SCp.Status) == QUEUE_FULL) {
2212 /* Turn a QUEUE FULL status into BUSY, I think the
2213 * mid level cannot handle QUEUE FULL :-( (The
2214 * command is retried after BUSY). Also update our
2215 * queue size to the number of currently issued
2216 * commands now.
2217 */
2218 /* ++Andreas: the mid level code knows about
2219 QUEUE_FULL now. */
2220 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
2221 TAG_PRINTK("scsi%d: target %d lun %d returned "
2222 "QUEUE_FULL after %d commands\n",
2223 HOSTNO, cmd->device->id, cmd->device->lun,
2224 ta->nr_allocated);
2225 if (ta->queue_size > ta->nr_allocated)
2226 ta->nr_allocated = ta->queue_size;
2227 }
2228 #else
2229 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2230 #endif
2231 /* Enable reselect interrupts */
2232 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2233
2234 /*
2235 * I'm not sure what the correct thing to do here is :
2236 *
2237 * If the command that just executed is NOT a request
2238 * sense, the obvious thing to do is to set the result
2239 * code to the values of the stored parameters.
2240 *
2241 * If it was a REQUEST SENSE command, we need some way to
2242 * differentiate between the failure code of the original
2243 * and the failure code of the REQUEST sense - the obvious
2244 * case is success, where we fall through and leave the
2245 * result code unchanged.
2246 *
2247 * The non-obvious place is where the REQUEST SENSE failed
2248 */
2249
2250 if (cmd->cmnd[0] != REQUEST_SENSE)
2251 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2252 else if (status_byte(cmd->SCp.Status) != GOOD)
2253 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
2254
2255 #ifdef AUTOSENSE
2256 if ((cmd->cmnd[0] == REQUEST_SENSE) &&
2257 hostdata->ses.cmd_len) {
2258 scsi_eh_restore_cmnd(cmd, &hostdata->ses);
2259 hostdata->ses.cmd_len = 0 ;
2260 }
2261
2262 if ((cmd->cmnd[0] != REQUEST_SENSE) &&
2263 (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) {
2264 scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0);
2265 ASEN_PRINTK("scsi%d: performing request sense\n",
2266 HOSTNO);
2267 /* this is initialized from initialize_SCp
2268 cmd->SCp.buffer = NULL;
2269 cmd->SCp.buffers_residual = 0;
2270 */
2271
2272 local_irq_save(flags);
2273 LIST(cmd,hostdata->issue_queue);
2274 NEXT(cmd) = hostdata->issue_queue;
2275 hostdata->issue_queue = (struct scsi_cmnd *) cmd;
2276 local_irq_restore(flags);
2277 QU_PRINTK("scsi%d: REQUEST SENSE added to head of "
2278 "issue queue\n", H_NO(cmd));
2279 } else
2280 #endif /* def AUTOSENSE */
2281 {
2282 #ifdef NCR5380_STATS
2283 collect_stats(hostdata, cmd);
2284 #endif
2285 cmd->scsi_done(cmd);
2286 }
2287
2288 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2289 /*
2290 * Restore phase bits to 0 so an interrupted selection,
2291 * arbitration can resume.
2292 */
2293 NCR5380_write(TARGET_COMMAND_REG, 0);
2294
2295 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2296 barrier();
2297
2298 return;
2299 case MESSAGE_REJECT:
2300 /* Accept message by clearing ACK */
2301 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2302 /* Enable reselect interrupts */
2303 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2304 switch (hostdata->last_message) {
2305 case HEAD_OF_QUEUE_TAG:
2306 case ORDERED_QUEUE_TAG:
2307 case SIMPLE_QUEUE_TAG:
2308 /* The target obviously doesn't support tagged
2309 * queuing, even though it announced this ability in
2310 * its INQUIRY data ?!? (maybe only this LUN?) Ok,
2311 * clear 'tagged_supported' and lock the LUN, since
2312 * the command is treated as untagged further on.
2313 */
2314 cmd->device->tagged_supported = 0;
2315 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
2316 cmd->tag = TAG_NONE;
2317 TAG_PRINTK("scsi%d: target %d lun %d rejected "
2318 "QUEUE_TAG message; tagged queuing "
2319 "disabled\n",
2320 HOSTNO, cmd->device->id, cmd->device->lun);
2321 break;
2322 }
2323 break;
2324 case DISCONNECT:
2325 /* Accept message by clearing ACK */
2326 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2327 local_irq_save(flags);
2328 cmd->device->disconnect = 1;
2329 LIST(cmd,hostdata->disconnected_queue);
2330 NEXT(cmd) = hostdata->disconnected_queue;
2331 hostdata->connected = NULL;
2332 hostdata->disconnected_queue = cmd;
2333 local_irq_restore(flags);
2334 QU_PRINTK("scsi%d: command for target %d lun %d was "
2335 "moved from connected to the "
2336 "disconnected_queue\n", HOSTNO,
2337 cmd->device->id, cmd->device->lun);
2338 /*
2339 * Restore phase bits to 0 so an interrupted selection,
2340 * arbitration can resume.
2341 */
2342 NCR5380_write(TARGET_COMMAND_REG, 0);
2343
2344 /* Enable reselect interrupts */
2345 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2346 /* Wait for bus free to avoid nasty timeouts */
2347 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2348 barrier();
2349 #ifdef SUN3_SCSI_VME
2350 dregs->csr |= CSR_DMA_ENABLE;
2351 #endif
2352 return;
2353 /*
2354 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2355 * operation, in violation of the SCSI spec so we can safely
2356 * ignore SAVE/RESTORE pointers calls.
2357 *
2358 * Unfortunately, some disks violate the SCSI spec and
2359 * don't issue the required SAVE_POINTERS message before
2360 * disconnecting, and we have to break spec to remain
2361 * compatible.
2362 */
2363 case SAVE_POINTERS:
2364 case RESTORE_POINTERS:
2365 /* Accept message by clearing ACK */
2366 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2367 /* Enable reselect interrupts */
2368 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2369 break;
2370 case EXTENDED_MESSAGE:
2371 /*
2372 * Extended messages are sent in the following format :
2373 * Byte
2374 * 0 EXTENDED_MESSAGE == 1
2375 * 1 length (includes one byte for code, doesn't
2376 * include first two bytes)
2377 * 2 code
2378 * 3..length+1 arguments
2379 *
2380 * Start the extended message buffer with the EXTENDED_MESSAGE
2381 * byte, since spi_print_msg() wants the whole thing.
2382 */
2383 extended_msg[0] = EXTENDED_MESSAGE;
2384 /* Accept first byte by clearing ACK */
2385 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2386
2387 EXT_PRINTK("scsi%d: receiving extended message\n", HOSTNO);
2388
2389 len = 2;
2390 data = extended_msg + 1;
2391 phase = PHASE_MSGIN;
2392 NCR5380_transfer_pio(instance, &phase, &len, &data);
2393 EXT_PRINTK("scsi%d: length=%d, code=0x%02x\n", HOSTNO,
2394 (int)extended_msg[1], (int)extended_msg[2]);
2395
2396 if (!len && extended_msg[1] <=
2397 (sizeof (extended_msg) - 1)) {
2398 /* Accept third byte by clearing ACK */
2399 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2400 len = extended_msg[1] - 1;
2401 data = extended_msg + 3;
2402 phase = PHASE_MSGIN;
2403
2404 NCR5380_transfer_pio(instance, &phase, &len, &data);
2405 EXT_PRINTK("scsi%d: message received, residual %d\n",
2406 HOSTNO, len);
2407
2408 switch (extended_msg[2]) {
2409 case EXTENDED_SDTR:
2410 case EXTENDED_WDTR:
2411 case EXTENDED_MODIFY_DATA_POINTER:
2412 case EXTENDED_EXTENDED_IDENTIFY:
2413 tmp = 0;
2414 }
2415 } else if (len) {
2416 printk(KERN_NOTICE "scsi%d: error receiving "
2417 "extended message\n", HOSTNO);
2418 tmp = 0;
2419 } else {
2420 printk(KERN_NOTICE "scsi%d: extended message "
2421 "code %02x length %d is too long\n",
2422 HOSTNO, extended_msg[2], extended_msg[1]);
2423 tmp = 0;
2424 }
2425 /* Fall through to reject message */
2426
2427 /*
2428 * If we get something weird that we aren't expecting,
2429 * reject it.
2430 */
2431 default:
2432 if (!tmp) {
2433 printk(KERN_DEBUG "scsi%d: rejecting message ", HOSTNO);
2434 spi_print_msg(extended_msg);
2435 printk("\n");
2436 } else if (tmp != EXTENDED_MESSAGE)
2437 printk(KERN_DEBUG "scsi%d: rejecting unknown "
2438 "message %02x from target %d, lun %d\n",
2439 HOSTNO, tmp, cmd->device->id, cmd->device->lun);
2440 else
2441 printk(KERN_DEBUG "scsi%d: rejecting unknown "
2442 "extended message "
2443 "code %02x, length %d from target %d, lun %d\n",
2444 HOSTNO, extended_msg[1], extended_msg[0],
2445 cmd->device->id, cmd->device->lun);
2446
2447
2448 msgout = MESSAGE_REJECT;
2449 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2450 ICR_ASSERT_ATN);
2451 break;
2452 } /* switch (tmp) */
2453 break;
2454 case PHASE_MSGOUT:
2455 len = 1;
2456 data = &msgout;
2457 hostdata->last_message = msgout;
2458 NCR5380_transfer_pio(instance, &phase, &len, &data);
2459 if (msgout == ABORT) {
2460 #ifdef SUPPORT_TAGS
2461 cmd_free_tag( cmd );
2462 #else
2463 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2464 #endif
2465 hostdata->connected = NULL;
2466 cmd->result = DID_ERROR << 16;
2467 #ifdef NCR5380_STATS
2468 collect_stats(hostdata, cmd);
2469 #endif
2470 cmd->scsi_done(cmd);
2471 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2472 return;
2473 }
2474 msgout = NOP;
2475 break;
2476 case PHASE_CMDOUT:
2477 len = cmd->cmd_len;
2478 data = cmd->cmnd;
2479 /*
2480 * XXX for performance reasons, on machines with a
2481 * PSEUDO-DMA architecture we should probably
2482 * use the dma transfer function.
2483 */
2484 NCR5380_transfer_pio(instance, &phase, &len,
2485 &data);
2486 break;
2487 case PHASE_STATIN:
2488 len = 1;
2489 data = &tmp;
2490 NCR5380_transfer_pio(instance, &phase, &len, &data);
2491 cmd->SCp.Status = tmp;
2492 break;
2493 default:
2494 printk("scsi%d: unknown phase\n", HOSTNO);
2495 NCR_PRINT(NDEBUG_ANY);
2496 } /* switch(phase) */
2497 } /* if (tmp * SR_REQ) */
2498 } /* while (1) */
2499 }
2500
2501 /*
2502 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2503 *
2504 * Purpose : does reselection, initializing the instance->connected
2505 * field to point to the struct scsi_cmnd for which the I_T_L or I_T_L_Q
2506 * nexus has been reestablished,
2507 *
2508 * Inputs : instance - this instance of the NCR5380.
2509 *
2510 */
2511
2512 /* it might eventually prove necessary to do a dma setup on
2513 reselection, but it doesn't seem to be needed now -- sam */
2514
NCR5380_reselect(struct Scsi_Host * instance)2515 static void NCR5380_reselect (struct Scsi_Host *instance)
2516 {
2517 SETUP_HOSTDATA(instance);
2518 unsigned char target_mask;
2519 unsigned char lun;
2520 #ifdef SUPPORT_TAGS
2521 unsigned char tag;
2522 #endif
2523 unsigned char msg[3];
2524 struct scsi_cmnd *tmp = NULL, *prev;
2525 /* unsigned long flags; */
2526
2527 /*
2528 * Disable arbitration, etc. since the host adapter obviously
2529 * lost, and tell an interrupted NCR5380_select() to restart.
2530 */
2531
2532 NCR5380_write(MODE_REG, MR_BASE);
2533 hostdata->restart_select = 1;
2534
2535 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
2536
2537 RSL_PRINTK("scsi%d: reselect\n", HOSTNO);
2538
2539 /*
2540 * At this point, we have detected that our SCSI ID is on the bus,
2541 * SEL is true and BSY was false for at least one bus settle delay
2542 * (400 ns).
2543 *
2544 * We must assert BSY ourselves, until the target drops the SEL
2545 * signal.
2546 */
2547
2548 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
2549
2550 while (NCR5380_read(STATUS_REG) & SR_SEL);
2551 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2552
2553 /*
2554 * Wait for target to go into MSGIN.
2555 */
2556
2557 while (!(NCR5380_read(STATUS_REG) & SR_REQ));
2558
2559 #if 1
2560 // acknowledge toggle to MSGIN
2561 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(PHASE_MSGIN));
2562
2563 // peek at the byte without really hitting the bus
2564 msg[0] = NCR5380_read(CURRENT_SCSI_DATA_REG);
2565 #endif
2566
2567 if (!(msg[0] & 0x80)) {
2568 printk(KERN_DEBUG "scsi%d: expecting IDENTIFY message, got ", HOSTNO);
2569 spi_print_msg(msg);
2570 do_abort(instance);
2571 return;
2572 }
2573 lun = (msg[0] & 0x07);
2574
2575 /*
2576 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2577 * just reestablished, and remove it from the disconnected queue.
2578 */
2579
2580 for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue, prev = NULL;
2581 tmp; prev = tmp, tmp = NEXT(tmp) ) {
2582 if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun)
2583 #ifdef SUPPORT_TAGS
2584 && (tag == tmp->tag)
2585 #endif
2586 ) {
2587 if (prev) {
2588 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
2589 NEXT(prev) = NEXT(tmp);
2590 } else {
2591 REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp));
2592 hostdata->disconnected_queue = NEXT(tmp);
2593 }
2594 NEXT(tmp) = NULL;
2595 break;
2596 }
2597 }
2598
2599 if (!tmp) {
2600 printk(KERN_WARNING "scsi%d: warning: target bitmask %02x lun %d "
2601 #ifdef SUPPORT_TAGS
2602 "tag %d "
2603 #endif
2604 "not in disconnected_queue.\n",
2605 HOSTNO, target_mask, lun
2606 #ifdef SUPPORT_TAGS
2607 , tag
2608 #endif
2609 );
2610 /*
2611 * Since we have an established nexus that we can't do anything
2612 * with, we must abort it.
2613 */
2614 do_abort(instance);
2615 return;
2616 }
2617 #if 1
2618 /* engage dma setup for the command we just saw */
2619 {
2620 void *d;
2621 unsigned long count;
2622
2623 if (!tmp->SCp.this_residual && tmp->SCp.buffers_residual) {
2624 count = tmp->SCp.buffer->length;
2625 d = SGADDR(tmp->SCp.buffer);
2626 } else {
2627 count = tmp->SCp.this_residual;
2628 d = tmp->SCp.ptr;
2629 }
2630 #ifdef REAL_DMA
2631 /* setup this command for dma if not already */
2632 if((count > SUN3_DMA_MINSIZE) && (sun3_dma_setup_done != tmp))
2633 {
2634 sun3scsi_dma_setup(d, count, rq_data_dir(tmp->request));
2635 sun3_dma_setup_done = tmp;
2636 }
2637 #endif
2638 }
2639 #endif
2640
2641 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
2642 /* Accept message by clearing ACK */
2643 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2644
2645 #ifdef SUPPORT_TAGS
2646 /* If the phase is still MSGIN, the target wants to send some more
2647 * messages. In case it supports tagged queuing, this is probably a
2648 * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
2649 */
2650 tag = TAG_NONE;
2651 if (phase == PHASE_MSGIN && setup_use_tagged_queuing) {
2652 /* Accept previous IDENTIFY message by clearing ACK */
2653 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
2654 len = 2;
2655 data = msg+1;
2656 if (!NCR5380_transfer_pio(instance, &phase, &len, &data) &&
2657 msg[1] == SIMPLE_QUEUE_TAG)
2658 tag = msg[2];
2659 TAG_PRINTK("scsi%d: target mask %02x, lun %d sent tag %d at "
2660 "reselection\n", HOSTNO, target_mask, lun, tag);
2661 }
2662 #endif
2663
2664 hostdata->connected = tmp;
2665 RSL_PRINTK("scsi%d: nexus established, target = %d, lun = %d, tag = %d\n",
2666 HOSTNO, tmp->target, tmp->lun, tmp->tag);
2667 }
2668
2669
2670 /*
2671 * Function : int NCR5380_abort(struct scsi_cmnd *cmd)
2672 *
2673 * Purpose : abort a command
2674 *
2675 * Inputs : cmd - the struct scsi_cmnd to abort, code - code to set the
2676 * host byte of the result field to, if zero DID_ABORTED is
2677 * used.
2678 *
2679 * Returns : 0 - success, -1 on failure.
2680 *
2681 * XXX - there is no way to abort the command that is currently
2682 * connected, you have to wait for it to complete. If this is
2683 * a problem, we could implement longjmp() / setjmp(), setjmp()
2684 * called where the loop started in NCR5380_main().
2685 */
2686
NCR5380_abort(struct scsi_cmnd * cmd)2687 static int NCR5380_abort(struct scsi_cmnd *cmd)
2688 {
2689 struct Scsi_Host *instance = cmd->device->host;
2690 SETUP_HOSTDATA(instance);
2691 struct scsi_cmnd *tmp, **prev;
2692 unsigned long flags;
2693
2694 printk(KERN_NOTICE "scsi%d: aborting command\n", HOSTNO);
2695 scsi_print_command(cmd);
2696
2697 NCR5380_print_status (instance);
2698
2699 local_irq_save(flags);
2700
2701 ABRT_PRINTK("scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO,
2702 NCR5380_read(BUS_AND_STATUS_REG),
2703 NCR5380_read(STATUS_REG));
2704
2705 #if 1
2706 /*
2707 * Case 1 : If the command is the currently executing command,
2708 * we'll set the aborted flag and return control so that
2709 * information transfer routine can exit cleanly.
2710 */
2711
2712 if (hostdata->connected == cmd) {
2713
2714 ABRT_PRINTK("scsi%d: aborting connected command\n", HOSTNO);
2715 /*
2716 * We should perform BSY checking, and make sure we haven't slipped
2717 * into BUS FREE.
2718 */
2719
2720 /* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */
2721 /*
2722 * Since we can't change phases until we've completed the current
2723 * handshake, we have to source or sink a byte of data if the current
2724 * phase is not MSGOUT.
2725 */
2726
2727 /*
2728 * Return control to the executing NCR drive so we can clear the
2729 * aborted flag and get back into our main loop.
2730 */
2731
2732 if (do_abort(instance) == 0) {
2733 hostdata->aborted = 1;
2734 hostdata->connected = NULL;
2735 cmd->result = DID_ABORT << 16;
2736 #ifdef SUPPORT_TAGS
2737 cmd_free_tag( cmd );
2738 #else
2739 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2740 #endif
2741 local_irq_restore(flags);
2742 cmd->scsi_done(cmd);
2743 return SCSI_ABORT_SUCCESS;
2744 } else {
2745 /* local_irq_restore(flags); */
2746 printk("scsi%d: abort of connected command failed!\n", HOSTNO);
2747 return SCSI_ABORT_ERROR;
2748 }
2749 }
2750 #endif
2751
2752 /*
2753 * Case 2 : If the command hasn't been issued yet, we simply remove it
2754 * from the issue queue.
2755 */
2756 for (prev = (struct scsi_cmnd **) &(hostdata->issue_queue),
2757 tmp = (struct scsi_cmnd *) hostdata->issue_queue;
2758 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp))
2759 if (cmd == tmp) {
2760 REMOVE(5, *prev, tmp, NEXT(tmp));
2761 (*prev) = NEXT(tmp);
2762 NEXT(tmp) = NULL;
2763 tmp->result = DID_ABORT << 16;
2764 local_irq_restore(flags);
2765 ABRT_PRINTK("scsi%d: abort removed command from issue queue.\n",
2766 HOSTNO);
2767 /* Tagged queuing note: no tag to free here, hasn't been assigned
2768 * yet... */
2769 tmp->scsi_done(tmp);
2770 return SCSI_ABORT_SUCCESS;
2771 }
2772
2773 /*
2774 * Case 3 : If any commands are connected, we're going to fail the abort
2775 * and let the high level SCSI driver retry at a later time or
2776 * issue a reset.
2777 *
2778 * Timeouts, and therefore aborted commands, will be highly unlikely
2779 * and handling them cleanly in this situation would make the common
2780 * case of noresets less efficient, and would pollute our code. So,
2781 * we fail.
2782 */
2783
2784 if (hostdata->connected) {
2785 local_irq_restore(flags);
2786 ABRT_PRINTK("scsi%d: abort failed, command connected.\n", HOSTNO);
2787 return SCSI_ABORT_SNOOZE;
2788 }
2789
2790 /*
2791 * Case 4: If the command is currently disconnected from the bus, and
2792 * there are no connected commands, we reconnect the I_T_L or
2793 * I_T_L_Q nexus associated with it, go into message out, and send
2794 * an abort message.
2795 *
2796 * This case is especially ugly. In order to reestablish the nexus, we
2797 * need to call NCR5380_select(). The easiest way to implement this
2798 * function was to abort if the bus was busy, and let the interrupt
2799 * handler triggered on the SEL for reselect take care of lost arbitrations
2800 * where necessary, meaning interrupts need to be enabled.
2801 *
2802 * When interrupts are enabled, the queues may change - so we
2803 * can't remove it from the disconnected queue before selecting it
2804 * because that could cause a failure in hashing the nexus if that
2805 * device reselected.
2806 *
2807 * Since the queues may change, we can't use the pointers from when we
2808 * first locate it.
2809 *
2810 * So, we must first locate the command, and if NCR5380_select()
2811 * succeeds, then issue the abort, relocate the command and remove
2812 * it from the disconnected queue.
2813 */
2814
2815 for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue; tmp;
2816 tmp = NEXT(tmp))
2817 if (cmd == tmp) {
2818 local_irq_restore(flags);
2819 ABRT_PRINTK("scsi%d: aborting disconnected command.\n", HOSTNO);
2820
2821 if (NCR5380_select (instance, cmd, (int) cmd->tag))
2822 return SCSI_ABORT_BUSY;
2823
2824 ABRT_PRINTK("scsi%d: nexus reestablished.\n", HOSTNO);
2825
2826 do_abort (instance);
2827
2828 local_irq_save(flags);
2829 for (prev = (struct scsi_cmnd **) &(hostdata->disconnected_queue),
2830 tmp = (struct scsi_cmnd *) hostdata->disconnected_queue;
2831 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp) )
2832 if (cmd == tmp) {
2833 REMOVE(5, *prev, tmp, NEXT(tmp));
2834 *prev = NEXT(tmp);
2835 NEXT(tmp) = NULL;
2836 tmp->result = DID_ABORT << 16;
2837 /* We must unlock the tag/LUN immediately here, since the
2838 * target goes to BUS FREE and doesn't send us another
2839 * message (COMMAND_COMPLETE or the like)
2840 */
2841 #ifdef SUPPORT_TAGS
2842 cmd_free_tag( tmp );
2843 #else
2844 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2845 #endif
2846 local_irq_restore(flags);
2847 tmp->scsi_done(tmp);
2848 return SCSI_ABORT_SUCCESS;
2849 }
2850 }
2851
2852 /*
2853 * Case 5 : If we reached this point, the command was not found in any of
2854 * the queues.
2855 *
2856 * We probably reached this point because of an unlikely race condition
2857 * between the command completing successfully and the abortion code,
2858 * so we won't panic, but we will notify the user in case something really
2859 * broke.
2860 */
2861
2862 local_irq_restore(flags);
2863 printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully\n"
2864 KERN_INFO " before abortion\n", HOSTNO);
2865
2866 return SCSI_ABORT_NOT_RUNNING;
2867 }
2868
2869
2870 /*
2871 * Function : int NCR5380_bus_reset(struct scsi_cmnd *cmd)
2872 *
2873 * Purpose : reset the SCSI bus.
2874 *
2875 * Returns : SCSI_RESET_WAKEUP
2876 *
2877 */
2878
NCR5380_bus_reset(struct scsi_cmnd * cmd)2879 static int NCR5380_bus_reset(struct scsi_cmnd *cmd)
2880 {
2881 SETUP_HOSTDATA(cmd->device->host);
2882 int i;
2883 unsigned long flags;
2884 #if 1
2885 struct scsi_cmnd *connected, *disconnected_queue;
2886 #endif
2887
2888
2889 NCR5380_print_status (cmd->device->host);
2890
2891 /* get in phase */
2892 NCR5380_write( TARGET_COMMAND_REG,
2893 PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
2894 /* assert RST */
2895 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
2896 udelay (40);
2897 /* reset NCR registers */
2898 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
2899 NCR5380_write( MODE_REG, MR_BASE );
2900 NCR5380_write( TARGET_COMMAND_REG, 0 );
2901 NCR5380_write( SELECT_ENABLE_REG, 0 );
2902 /* ++roman: reset interrupt condition! otherwise no interrupts don't get
2903 * through anymore ... */
2904 (void)NCR5380_read( RESET_PARITY_INTERRUPT_REG );
2905
2906 #if 1 /* XXX Should now be done by midlevel code, but it's broken XXX */
2907 /* XXX see below XXX */
2908
2909 /* MSch: old-style reset: actually abort all command processing here */
2910
2911 /* After the reset, there are no more connected or disconnected commands
2912 * and no busy units; to avoid problems with re-inserting the commands
2913 * into the issue_queue (via scsi_done()), the aborted commands are
2914 * remembered in local variables first.
2915 */
2916 local_irq_save(flags);
2917 connected = (struct scsi_cmnd *)hostdata->connected;
2918 hostdata->connected = NULL;
2919 disconnected_queue = (struct scsi_cmnd *)hostdata->disconnected_queue;
2920 hostdata->disconnected_queue = NULL;
2921 #ifdef SUPPORT_TAGS
2922 free_all_tags();
2923 #endif
2924 for( i = 0; i < 8; ++i )
2925 hostdata->busy[i] = 0;
2926 #ifdef REAL_DMA
2927 hostdata->dma_len = 0;
2928 #endif
2929 local_irq_restore(flags);
2930
2931 /* In order to tell the mid-level code which commands were aborted,
2932 * set the command status to DID_RESET and call scsi_done() !!!
2933 * This ultimately aborts processing of these commands in the mid-level.
2934 */
2935
2936 if ((cmd = connected)) {
2937 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
2938 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2939 cmd->scsi_done( cmd );
2940 }
2941
2942 for (i = 0; (cmd = disconnected_queue); ++i) {
2943 disconnected_queue = NEXT(cmd);
2944 NEXT(cmd) = NULL;
2945 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2946 cmd->scsi_done( cmd );
2947 }
2948 if (i > 0)
2949 ABRT_PRINTK("scsi: reset aborted %d disconnected command(s)\n", i);
2950
2951
2952 /* since all commands have been explicitly terminated, we need to tell
2953 * the midlevel code that the reset was SUCCESSFUL, and there is no
2954 * need to 'wake up' the commands by a request_sense
2955 */
2956 return SCSI_RESET_SUCCESS | SCSI_RESET_BUS_RESET;
2957 #else /* 1 */
2958
2959 /* MSch: new-style reset handling: let the mid-level do what it can */
2960
2961 /* ++guenther: MID-LEVEL IS STILL BROKEN.
2962 * Mid-level is supposed to requeue all commands that were active on the
2963 * various low-level queues. In fact it does this, but that's not enough
2964 * because all these commands are subject to timeout. And if a timeout
2965 * happens for any removed command, *_abort() is called but all queues
2966 * are now empty. Abort then gives up the falcon lock, which is fatal,
2967 * since the mid-level will queue more commands and must have the lock
2968 * (it's all happening inside timer interrupt handler!!).
2969 * Even worse, abort will return NOT_RUNNING for all those commands not
2970 * on any queue, so they won't be retried ...
2971 *
2972 * Conclusion: either scsi.c disables timeout for all resetted commands
2973 * immediately, or we lose! As of linux-2.0.20 it doesn't.
2974 */
2975
2976 /* After the reset, there are no more connected or disconnected commands
2977 * and no busy units; so clear the low-level status here to avoid
2978 * conflicts when the mid-level code tries to wake up the affected
2979 * commands!
2980 */
2981
2982 if (hostdata->issue_queue)
2983 ABRT_PRINTK("scsi%d: reset aborted issued command(s)\n", H_NO(cmd));
2984 if (hostdata->connected)
2985 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
2986 if (hostdata->disconnected_queue)
2987 ABRT_PRINTK("scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd));
2988
2989 local_irq_save(flags);
2990 hostdata->issue_queue = NULL;
2991 hostdata->connected = NULL;
2992 hostdata->disconnected_queue = NULL;
2993 #ifdef SUPPORT_TAGS
2994 free_all_tags();
2995 #endif
2996 for( i = 0; i < 8; ++i )
2997 hostdata->busy[i] = 0;
2998 #ifdef REAL_DMA
2999 hostdata->dma_len = 0;
3000 #endif
3001 local_irq_restore(flags);
3002
3003 /* we did no complete reset of all commands, so a wakeup is required */
3004 return SCSI_RESET_WAKEUP | SCSI_RESET_BUS_RESET;
3005 #endif /* 1 */
3006 }
3007
3008 /* Local Variables: */
3009 /* tab-width: 8 */
3010 /* End: */
3011